Merge branch 'master' into simple-extensions

COPYING

@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 2012, 2014, 2015 Tatsuhiro Tsujikawa
+Copyright (c) 2012, 2014, 2015, 2016 Tatsuhiro Tsujikawa
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

LICENSE

@@ -0,0 +1 @@
+See COPYING

README.rst

@@ -274,7 +274,7 @@ for this 24 bytes byte string and updated API.
   ``NGHTTP2_CLIENT_MAGIC_LEN``.
 * ``NGHTTP2_BAD_PREFACE`` was renamed as ``NGHTTP2_BAD_CLIENT_MAGIC``
 
-The alreay deprecated ``NGHTTP2_CLIENT_CONNECTION_HEADER`` and
+The already deprecated ``NGHTTP2_CLIENT_CONNECTION_HEADER`` and
 ``NGHTTP2_CLIENT_CONNECTION_HEADER_LEN`` were removed.
 
 If application uses these macros, just replace old ones with new ones.

configure.ac

@@ -25,7 +25,7 @@ dnl Do not change user variables!
 dnl http://www.gnu.org/software/automake/manual/html_node/Flag-Variables-Ordering.html
 
 AC_PREREQ(2.61)
-AC_INIT([nghttp2], [1.5.1-DEV], [t-tujikawa@users.sourceforge.net])
+AC_INIT([nghttp2], [1.6.1-DEV], [t-tujikawa@users.sourceforge.net])
 AC_CONFIG_AUX_DIR([.])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
@@ -46,9 +46,9 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 dnl See versioning rule:
 dnl  http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
-AC_SUBST(LT_CURRENT, 17)
+AC_SUBST(LT_CURRENT, 18)
 AC_SUBST(LT_REVISION, 0)
-AC_SUBST(LT_AGE, 3)
+AC_SUBST(LT_AGE, 4)
 
 major=`echo $PACKAGE_VERSION |cut -d. -f1 | sed -e "s/[^0-9]//g"`
 minor=`echo $PACKAGE_VERSION |cut -d. -f2 | sed -e "s/[^0-9]//g"`
@@ -104,6 +104,11 @@ AC_ARG_ENABLE([failmalloc],
                     [Do not build failmalloc test program])],
     [request_failmalloc=$enableval], [request_failmalloc=yes])
 
+AC_ARG_ENABLE([lib-only],
+    [AS_HELP_STRING([--enable-lib-only],
+                    [Build libnghttp2 only.  This is a short hand for --disable-app --disable-examples --disable-hpack-tools --disable-python-bindings])],
+    [request_lib_only=$enableval], [request_lib_only=no])
+
 AC_ARG_WITH([libxml2],
     [AS_HELP_STRING([--with-libxml2],
                     [Use libxml2 [default=check]])],
@@ -150,6 +155,13 @@ PKG_PROG_PKG_CONFIG([0.20])
 
 AM_PATH_PYTHON([2.7],, [:])
 
+if [test "x$request_lib_only" = "xyes"]; then
+  request_app=no
+  request_hpack_tools=no
+  request_examples=no
+  request_python_bindings=no
+fi
+
 if [test "x$request_python_bindings" != "xno"]; then
   AX_PYTHON_DEVEL([>= '2.7'])
 fi
@@ -243,6 +255,11 @@ if test "x${have_zlib}" = "xno"; then
   AC_MSG_NOTICE($ZLIB_PKG_ERRORS)
 fi
 
+# dl: openssl requires libdl when it is statically linked.
+LIBS_OLD=$LIBS
+AC_SEARCH_LIBS([dlopen], [dl], [APPLDFLAGS="-ldl $APPLDFLAGS"], [], [])
+LIBS=$LIBS_OLD
+
 # cunit
 PKG_CHECK_MODULES([CUNIT], [cunit >= 2.1], [have_cunit=yes], [have_cunit=no])
 # If pkg-config does not find cunit, check it using AC_CHECK_LIB.  We
@@ -613,6 +630,10 @@ AC_CHECK_FUNCS([ \
 AC_CHECK_FUNC([timerfd_create],
               [have_timerfd_create=yes], [have_timerfd_create=no])
 
+# For cygwin: we can link initgroups, so AC_CHECK_FUNCS succeeds, but
+# cygwin disables initgroups due to feature test macro magic with our
+# configuration.
+AC_CHECK_DECLS([initgroups], [], [], [[#include <grp.h>]])
 
 # Checks for epoll availability, primarily for examples/tiny-nghttpd
 AX_HAVE_EPOLL([have_epoll=yes], [have_epoll=no])

doc/conf.py.in

@@ -66,7 +66,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = u'nghttp2'
-copyright = u'2012, 2015, Tatsuhiro Tsujikawa'
+copyright = u'2012, 2015, 2016, Tatsuhiro Tsujikawa'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the

doc/h2load.1

@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "H2LOAD" "1" "November 29, 2015" "1.5.1-DEV" "nghttp2"
+.TH "H2LOAD" "1" "December 23, 2015" "1.6.0" "nghttp2"
 .SH NAME
 h2load \- HTTP/2 benchmarking tool
 .
@@ -374,6 +374,28 @@ The fraction of the number of connections within standard
 deviation range (mean +/\- sd) against total number of successful
 connections.
 .UNINDENT
+.TP
+.B req/s
+.INDENT 7.0
+.TP
+.B min
+The minimum request per second among all clients.
+.TP
+.B max
+The maximum request per second among all clients.
+.TP
+.B mean
+The mean request per second among all clients.
+.TP
+.B sd
+The standard deviation of request per second among all clients.
+server.
+.TP
+.B +/\- sd
+The fraction of the number of connections within standard
+deviation range (mean +/\- sd) against total number of successful
+connections.
+.UNINDENT
 .UNINDENT
 .SH FLOW CONTROL
 .sp

doc/h2load.1.rst

@@ -213,6 +213,8 @@ is 1 second and 500ms is 500 milliseconds).  Units are h, m, s or ms
 (hours, minutes, seconds and milliseconds, respectively).  If a unit
 is omitted, a second is used as unit.
 
+.. _h2load-1-output:
+
 OUTPUT
 ------
 
@@ -301,6 +303,21 @@ time for 1st byte (of (decrypted in case of TLS) application data)
     deviation range (mean +/- sd) against total number of successful
     connections.
 
+req/s
+  min
+    The minimum request per second among all clients.
+  max
+    The maximum request per second among all clients.
+  mean
+    The mean request per second among all clients.
+  sd
+    The standard deviation of request per second among all clients.
+    server.
+  +/- sd
+    The fraction of the number of connections within standard
+    deviation range (mean +/- sd) against total number of successful
+    connections.
+
 FLOW CONTROL
 ------------
 

doc/h2load.h2r

@@ -1,3 +1,5 @@
+.. _h2load-1-output:
+
 OUTPUT
 ------
 
@@ -86,7 +88,7 @@ time for 1st byte (of (decrypted in case of TLS) application data)
     deviation range (mean +/- sd) against total number of successful
     connections.
 
-req/s (client)
+req/s
   min
     The minimum request per second among all clients.
   max

doc/nghttp.1

@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "NGHTTP" "1" "November 29, 2015" "1.5.1-DEV" "nghttp2"
+.TH "NGHTTP" "1" "December 23, 2015" "1.6.0" "nghttp2"
 .SH NAME
 nghttp \- HTTP/2 client
 .
@@ -152,7 +152,8 @@ Default: \fB16\fP
 .B \-M, \-\-peer\-max\-concurrent\-streams=<N>
 Use  <N>  as  SETTINGS_MAX_CONCURRENT_STREAMS  value  of
 remote endpoint as if it  is received in SETTINGS frame.
-The default is large enough as it is seen as unlimited.
+.sp
+Default: \fB100\fP
 .UNINDENT
 .INDENT 0.0
 .TP

doc/nghttp.1.rst

@@ -116,7 +116,8 @@ OPTIONS
 
     Use  <N>  as  SETTINGS_MAX_CONCURRENT_STREAMS  value  of
     remote endpoint as if it  is received in SETTINGS frame.
-    The default is large enough as it is seen as unlimited.
+
+    Default: ``100``
 
 .. option:: -c, --header-table-size=<SIZE>
 

doc/nghttpd.1

@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "NGHTTPD" "1" "November 29, 2015" "1.5.1-DEV" "nghttp2"
+.TH "NGHTTPD" "1" "December 23, 2015" "1.6.0" "nghttp2"
 .SH NAME
 nghttpd \- HTTP/2 server
 .

doc/nghttpx.1

@@ -1,6 +1,6 @@
 .\" Man page generated from reStructuredText.
 .
-.TH "NGHTTPX" "1" "November 29, 2015" "1.5.1-DEV" "nghttp2"
+.TH "NGHTTPX" "1" "December 23, 2015" "1.6.0" "nghttp2"
 .SH NAME
 nghttpx \- HTTP/2 proxy
 .

doc/sources/h2load-howto.rst

@@ -1,10 +1,10 @@
 h2load - HTTP/2 benchmarking tool - HOW-TO
 ==========================================
 
-h2load is benchmarking tool for HTTP/2.  If built with
+h2load is benchmarking tool for HTTP/2 and HTTP/1.1.  If built with
 spdylay (http://tatsuhiro-t.github.io/spdylay/) library, it also
-supports SPDY protocol.  It supports SSL/TLS and clear text for both
+supports SPDY protocol.  It supports SSL/TLS and clear text for all
-HTTP/2 and SPDY.
+supported protocols.
 
 Basic Usage
 -----------
@@ -22,29 +22,37 @@ In order to set benchmark settings, specify following 3 options.
    If ``auto`` is given, the number of given URIs is used.
    Default: ``auto``
 
+For SSL/TLS connection, the protocol will be negotiated via ALPN/NPN.
+You can set specific protocols in ``--npn-list`` option.  For
+cleartext connection, the default protocol is HTTP/2.  To change the
+protocol in cleartext connection, use ``--no-tls-proto`` option.  For
+convenience, ``--h1`` option forces HTTP/1.1 for both cleartext and
+SSL/TLS connections.
+
 Here is a command-line to perform benchmark to URI \https://localhost
 using total 100000 requests, 100 concurrent clients and 10 max
-concurrent streams::
+concurrent streams:
+
+.. code-block:: text
 
     $ h2load -n100000 -c100 -m10 https://localhost
 
-The benchmarking result looks like this::
+The benchmarking result looks like this:
 
-    finished in 0 sec, 385 millisec and 851 microsec, 2591 req/s, 1689 kbytes/s
+.. code-block:: text
-    requests: 1000 total, 1000 started, 1000 done, 1000 succeeded, 0 failed, 0 errored
-    status codes: 1000 2xx, 0 3xx, 0 4xx, 0 5xx
-    traffic: 667500 bytes total, 28700 bytes headers, 612000 bytes data
 
-The number of ``failed`` is the number of requests returned with non
+    finished in 7.08s, 141164.80 req/s, 555.33MB/s
-2xx status.  The number of ``error`` is the number of ``failed`` plus
+    requests: 1000000 total, 1000000 started, 1000000 done, 1000000 succeeded, 0 failed, 0 errored, 0 timeout
-the number of requests which failed with connection error.
+    status codes: 1000000 2xx, 0 3xx, 0 4xx, 0 5xx
+    traffic: 4125025824 bytes total, 11023424 bytes headers (space savings 93.07%), 4096000000 bytes data
+                         min         max         mean         sd        +/- sd
+    time for request:    15.31ms    146.85ms     69.78ms      9.26ms    92.43%
+    time for connect:     1.08ms     25.04ms     10.71ms      9.80ms    64.00%
+    time to 1st byte:    25.36ms    184.96ms     79.11ms     53.97ms    78.00%
+    req/s (client)  :    1412.04     1447.84     1426.52       10.57    63.00%
 
-The number of ``total`` in ``traffic`` is the received application
+See the h2load manual page :ref:`h2load-1-output` section for the
-data.  If SSL/TLS is used, this number is calculated after decryption.
+explanation of the above numbers.
-The number of ``headers`` is the sum of payload size of response
-HEADERS (or SYN_REPLY for SPDY).  This number comes before
-decompressing header block.  The number of ``data`` is the sum of
-response body.
 
 Flow Control
 ------------

lib/includes/nghttp2/nghttp2.h

@@ -3296,6 +3296,9 @@ nghttp2_priority_spec_check_default(const nghttp2_priority_spec *pri_spec);
  * :enum:`NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE`
  *     No stream ID is available because maximum stream ID was
  *     reached.
+ * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
+ *     Trying to depend on itself (new stream ID equals
+ *     ``pri_spec->stream_id``).
  *
  * .. warning::
  *
@@ -3407,7 +3410,7 @@ nghttp2_submit_response(nghttp2_session *session, int32_t stream_id,
  * has already sent and if `nghttp2_submit_trailer()` is called before
  * any response HEADERS submission (usually by
  * `nghttp2_submit_response()`), the content of |nva| will be sent as
- * reponse headers, which will result in error.
+ * response headers, which will result in error.
  *
  * This function has the same effect with `nghttp2_submit_headers()`,
  * with flags = :enum:`NGHTTP2_FLAG_END_HEADERS` and both pri_spec and
@@ -3506,7 +3509,8 @@ NGHTTP2_EXTERN int nghttp2_submit_trailer(nghttp2_session *session,
  *     No stream ID is available because maximum stream ID was
  *     reached.
  * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
- *     The |stream_id| is 0.
+ *     The |stream_id| is 0; or trying to depend on itself (stream ID
+ *     equals ``pri_spec->stream_id``).
  * :enum:`NGHTTP2_ERR_DATA_EXIST`
  *     DATA or HEADERS has been already submitted and not fully
  *     processed yet.  This happens if stream denoted by |stream_id|
@@ -3549,7 +3553,7 @@ nghttp2_submit_headers(nghttp2_session *session, uint8_t flags,
  * :enum:`NGHTTP2_ERR_INVALID_ARGUMENT`
  *     The |stream_id| is 0.
  * :enum:`NGHTTP2_ERR_STREAM_CLOSED`
- *     The stream was alreay closed; or the |stream_id| is invalid.
+ *     The stream was already closed; or the |stream_id| is invalid.
  *
  * .. note::
  *
@@ -3718,7 +3722,7 @@ NGHTTP2_EXTERN int nghttp2_submit_settings(nghttp2_session *session,
  *     The |stream_id| is 0; The |stream_id| does not designate stream
  *     that peer initiated.
  * :enum:`NGHTTP2_ERR_STREAM_CLOSED`
- *     The stream was alreay closed; or the |stream_id| is invalid.
+ *     The stream was already closed; or the |stream_id| is invalid.
  *
  * .. warning::
  *
@@ -4336,7 +4340,7 @@ typedef enum {
  * :enum:`NGHTTP2_ERR_HEADER_COMP`
  *     Inflation process has failed.
  * :enum:`NGHTTP2_ERR_BUFFER_ERROR`
- *     The heder field name or value is too large.
+ *     The header field name or value is too large.
  *
  * Example follows::
  *

lib/nghttp2_outbound_item.h

@@ -43,9 +43,6 @@ typedef struct {
   /* nonzero if request HEADERS is canceled.  The error code is stored
      in |error_code|. */
   uint8_t canceled;
-  /* nonzero if this item should be attached to stream object to make
-     it under priority control */
-  uint8_t attach_stream;
 } nghttp2_headers_aux_data;
 
 /* struct used for DATA frame */

lib/nghttp2_pq.c

@@ -44,11 +44,13 @@ void nghttp2_pq_free(nghttp2_pq *pq) {
 }
 
 static void swap(nghttp2_pq *pq, size_t i, size_t j) {
-  nghttp2_pq_entry *t = pq->q[i];
+  nghttp2_pq_entry *a = pq->q[i];
-  pq->q[i] = pq->q[j];
+  nghttp2_pq_entry *b = pq->q[j];
-  pq->q[i]->index = i;
+
-  pq->q[j] = t;
+  pq->q[i] = b;
-  pq->q[j]->index = j;
+  b->index = i;
+  pq->q[j] = a;
+  a->index = j;
 }
 
 static void bubble_up(nghttp2_pq *pq, size_t index) {

lib/nghttp2_session.c

@@ -635,7 +635,7 @@ int nghttp2_session_reprioritize_stream(
   if (pri_spec->stream_id != 0) {
     dep_stream = nghttp2_session_get_stream_raw(session, pri_spec->stream_id);
 
-    if (session->server && !dep_stream &&
+    if (!dep_stream &&
         session_detect_idle_stream(session, pri_spec->stream_id)) {
 
       nghttp2_priority_spec_default_init(&pri_spec_default);
@@ -671,15 +671,9 @@ int nghttp2_session_reprioritize_stream(
   assert(dep_stream);
 
   if (dep_stream == stream->dep_prev && !pri_spec->exclusive) {
-    /* This is minor optimization when just weight is changed.
+    /* This is minor optimization when just weight is changed. */
-       Currently, we don't reschedule stream in this case, since we
+    nghttp2_stream_change_weight(stream, pri_spec->weight);
-       don't retain enough information to do that
+
-       (descendant_last_cycle we used to schedule it).  This means new
-       weight is only applied in the next scheduling, and if weight is
-       drastically increased, library is not responding very quickly.
-       If this is really an issue, we will do workaround for this. */
-    dep_stream->sum_dep_weight += pri_spec->weight - stream->weight;
-    stream->weight = pri_spec->weight;
     return 0;
   }
 
@@ -729,20 +723,6 @@ int nghttp2_session_add_item(nghttp2_session *session,
         break;
       }
 
-      if (stream && item->aux_data.headers.attach_stream) {
-        if (stream->item) {
-          return NGHTTP2_ERR_DATA_EXIST;
-        }
-
-        rv = nghttp2_stream_attach_item(stream, item);
-
-        if (rv != 0) {
-          return rv;
-        }
-
-        break;
-      }
-
       nghttp2_outbound_queue_push(&session->ob_reg, item);
       item->queued = 1;
       break;
@@ -778,6 +758,10 @@ int nghttp2_session_add_item(nghttp2_session *session,
         return NGHTTP2_ERR_NOMEM;
       }
 
+      /* We don't have to call nghttp2_session_adjust_closed_stream()
+         here, since stream->stream_id is local stream_id, and it does
+         not affect closed stream count. */
+
       nghttp2_outbound_queue_push(&session->ob_reg, item);
       item->queued = 1;
 
@@ -909,15 +893,6 @@ nghttp2_stream *nghttp2_session_open_stream(nghttp2_session *session,
       return NULL;
     }
   } else {
-    if (session->server && initial_state != NGHTTP2_STREAM_IDLE &&
-        !nghttp2_session_is_my_stream_id(session, stream_id)) {
-
-      rv = nghttp2_session_adjust_closed_stream(session, 1);
-      if (rv != 0) {
-        return NULL;
-      }
-    }
-
     stream = nghttp2_mem_malloc(mem, sizeof(nghttp2_stream));
     if (stream == NULL) {
       return NULL;
@@ -929,7 +904,7 @@ nghttp2_stream *nghttp2_session_open_stream(nghttp2_session *session,
   if (pri_spec->stream_id != 0) {
     dep_stream = nghttp2_session_get_stream_raw(session, pri_spec->stream_id);
 
-    if (session->server && !dep_stream &&
+    if (!dep_stream &&
         session_detect_idle_stream(session, pri_spec->stream_id)) {
       /* Depends on idle stream, which does not exist in memory.
          Assign default priority for it. */
@@ -994,11 +969,7 @@ nghttp2_stream *nghttp2_session_open_stream(nghttp2_session *session,
   case NGHTTP2_STREAM_IDLE:
     /* Idle stream does not count toward the concurrent streams limit.
        This is used as anchor node in dependency tree. */
-    assert(session->server);
+    nghttp2_session_keep_idle_stream(session, stream);
-    rv = nghttp2_session_keep_idle_stream(session, stream);
-    if (rv != 0) {
-      return NULL;
-    }
     break;
   default:
     if (nghttp2_session_is_my_stream_id(session, stream_id)) {
@@ -1103,7 +1074,9 @@ int nghttp2_session_close_stream(nghttp2_session *session, int32_t stream_id,
     /* On server side, retain stream at most MAX_CONCURRENT_STREAMS
        combined with the current active incoming streams to make
        dependency tree work better. */
-    rv = nghttp2_session_keep_closed_stream(session, stream);
+    nghttp2_session_keep_closed_stream(session, stream);
+
+    rv = nghttp2_session_adjust_closed_stream(session);
   } else {
     rv = nghttp2_session_destroy_stream(session, stream);
   }
@@ -1138,10 +1111,8 @@ int nghttp2_session_destroy_stream(nghttp2_session *session,
   return 0;
 }
 
-int nghttp2_session_keep_closed_stream(nghttp2_session *session,
+void nghttp2_session_keep_closed_stream(nghttp2_session *session,
                                         nghttp2_stream *stream) {
-  int rv;
-
   DEBUGF(fprintf(stderr, "stream: keep closed stream(%p)=%d, state=%d\n",
                  stream, stream->stream_id, stream->state));
 
@@ -1154,19 +1125,10 @@ int nghttp2_session_keep_closed_stream(nghttp2_session *session,
   session->closed_stream_tail = stream;
 
   ++session->num_closed_streams;
-
-  rv = nghttp2_session_adjust_closed_stream(session, 0);
-  if (rv != 0) {
-    return rv;
 }
 
-  return 0;
+void nghttp2_session_keep_idle_stream(nghttp2_session *session,
-}
-
-int nghttp2_session_keep_idle_stream(nghttp2_session *session,
                                       nghttp2_stream *stream) {
-  int rv;
-
   DEBUGF(fprintf(stderr, "stream: keep idle stream(%p)=%d, state=%d\n", stream,
                  stream->stream_id, stream->state));
 
@@ -1179,13 +1141,6 @@ int nghttp2_session_keep_idle_stream(nghttp2_session *session,
   session->idle_stream_tail = stream;
 
   ++session->num_idle_streams;
-
-  rv = nghttp2_session_adjust_idle_stream(session);
-  if (rv != 0) {
-    return rv;
-  }
-
-  return 0;
 }
 
 void nghttp2_session_detach_idle_stream(nghttp2_session *session,
@@ -1216,8 +1171,7 @@ void nghttp2_session_detach_idle_stream(nghttp2_session *session,
   --session->num_idle_streams;
 }
 
-int nghttp2_session_adjust_closed_stream(nghttp2_session *session,
+int nghttp2_session_adjust_closed_stream(nghttp2_session *session) {
-                                         size_t offset) {
   size_t num_stream_max;
   int rv;
 
@@ -1231,7 +1185,7 @@ int nghttp2_session_adjust_closed_stream(nghttp2_session *session,
                  num_stream_max));
 
   while (session->num_closed_streams > 0 &&
-         session->num_closed_streams + session->num_incoming_streams + offset >
+         session->num_closed_streams + session->num_incoming_streams >
              num_stream_max) {
     nghttp2_stream *head_stream;
     nghttp2_stream *next;
@@ -1267,12 +1221,10 @@ int nghttp2_session_adjust_idle_stream(nghttp2_session *session) {
   size_t max;
   int rv;
 
-  /* Make minimum number of idle streams 2 so that allocating 2
+  /* Make minimum number of idle streams 16, which is arbitrary chosen
-     streams at once is easy.  This happens when PRIORITY frame to
+     number. */
-     idle stream, which depends on idle stream which does not
+  max = nghttp2_max(16,
-     exist. */
+                    nghttp2_min(session->local_settings.max_concurrent_streams,
-  max =
-      nghttp2_max(2, nghttp2_min(session->local_settings.max_concurrent_streams,
                                 session->pending_local_max_concurrent_stream));
 
   DEBUGF(fprintf(stderr, "stream: adjusting kept idle streams "
@@ -1331,6 +1283,15 @@ int nghttp2_session_close_stream_if_shut_rdwr(nghttp2_session *session,
   return 0;
 }
 
+/*
+ * Returns nonzero if local endpoint allows reception of new stream
+ * from remote.
+ */
+static int session_allow_incoming_new_stream(nghttp2_session *session) {
+  return (session->goaway_flags &
+          (NGHTTP2_GOAWAY_TERM_ON_SEND | NGHTTP2_GOAWAY_SENT)) == 0;
+}
+
 /*
  * This function returns nonzero if session is closing.
  */
@@ -1850,6 +1811,9 @@ static int session_prep_frame(nghttp2_session *session,
           return NGHTTP2_ERR_NOMEM;
         }
 
+        /* We don't call nghttp2_session_adjust_closed_stream() here,
+           since we don't keep closed stream in client side */
+
         estimated_payloadlen = session_estimate_headers_payload(
             session, frame->headers.nva, frame->headers.nvlen,
             NGHTTP2_PRIORITY_SPECLEN);
@@ -1899,7 +1863,7 @@ static int session_prep_frame(nghttp2_session *session,
         }
 
         if (rv != 0) {
-          // If stream was alreay closed, nghttp2_session_get_stream()
+          // If stream was already closed, nghttp2_session_get_stream()
           // returns NULL, but item is still attached to the stream.
           // Search stream including closed again.
           stream = nghttp2_session_get_stream_raw(session, frame->hd.stream_id);
@@ -2061,7 +2025,7 @@ static int session_prep_frame(nghttp2_session *session,
 
     rv = nghttp2_session_predicate_data_send(session, stream);
     if (rv != 0) {
-      // If stream was alreay closed, nghttp2_session_get_stream()
+      // If stream was already closed, nghttp2_session_get_stream()
       // returns NULL, but item is still attached to the stream.
       // Search stream including closed again.
       stream = nghttp2_session_get_stream_raw(session, frame->hd.stream_id);
@@ -2442,11 +2406,25 @@ static int session_after_frame_sent1(nghttp2_session *session) {
       stream = nghttp2_session_get_stream_raw(session, frame->hd.stream_id);
 
       if (!stream) {
+        if (!session_detect_idle_stream(session, frame->hd.stream_id)) {
           break;
         }
 
+        stream = nghttp2_session_open_stream(
+            session, frame->hd.stream_id, NGHTTP2_FLAG_NONE,
+            &frame->priority.pri_spec, NGHTTP2_STREAM_IDLE, NULL);
+        if (!stream) {
+          return NGHTTP2_ERR_NOMEM;
+        }
+      } else {
         rv = nghttp2_session_reprioritize_stream(session, stream,
                                                  &frame->priority.pri_spec);
+        if (nghttp2_is_fatal(rv)) {
+          return rv;
+        }
+      }
+
+      rv = nghttp2_session_adjust_idle_stream(session);
 
       if (nghttp2_is_fatal(rv)) {
         return rv;
@@ -2612,6 +2590,8 @@ static int session_after_frame_sent2(nghttp2_session *session) {
   nghttp2_bufs *framebufs = &aob->framebufs;
   nghttp2_frame *frame;
   nghttp2_mem *mem;
+  nghttp2_stream *stream;
+  nghttp2_data_aux_data *aux_data;
 
   mem = &session->mem;
   frame = &item->frame;
@@ -2634,9 +2614,9 @@ static int session_after_frame_sent2(nghttp2_session *session) {
     active_outbound_item_reset(&session->aob, mem);
 
     return 0;
-  } else {
+  }
-    nghttp2_stream *stream;
+
-    nghttp2_data_aux_data *aux_data;
+  /* DATA frame */
 
   aux_data = &item->aux_data.data;
 
@@ -2676,10 +2656,6 @@ static int session_after_frame_sent2(nghttp2_session *session) {
 
   return 0;
 }
-  /* Unreachable */
-  assert(0);
-  return 0;
-}
 
 static int session_call_send_data(nghttp2_session *session,
                                   nghttp2_outbound_item *item,
@@ -2722,6 +2698,14 @@ static ssize_t nghttp2_session_mem_send_internal(nghttp2_session *session,
   aob = &session->aob;
   framebufs = &aob->framebufs;
 
+  /* We may have idle streams more than we expect (e.g.,
+     nghttp2_session_change_stream_priority() or
+     nghttp2_session_create_idle_stream()).  Adjust them here. */
+  rv = nghttp2_session_adjust_idle_stream(session);
+  if (nghttp2_is_fatal(rv)) {
+    return rv;
+  }
+
   *data_ptr = NULL;
   for (;;) {
     switch (aob->state) {
@@ -3519,35 +3503,44 @@ int nghttp2_session_on_request_headers_received(nghttp2_session *session,
     return NGHTTP2_ERR_IGN_HEADER_BLOCK;
   }
 
+  assert(session->server);
+
   if (!session_is_new_peer_stream_id(session, frame->hd.stream_id)) {
     /* The spec says if an endpoint receives a HEADERS with invalid
        stream ID, it MUST issue connection error with error code
        PROTOCOL_ERROR.  But we could get trailer HEADERS after we have
        sent RST_STREAM to this stream and peer have not received it.
        Then connection error is too harsh.  It means that we only use
-       connection error if stream ID refers idle stream.  OTherwise we
+       connection error if stream ID refers idle stream.  Therwise we
        just ignore HEADERS for now. */
-    if (session_detect_idle_stream(session, frame->hd.stream_id)) {
+    if (frame->hd.stream_id == 0 ||
+        nghttp2_session_is_my_stream_id(session, frame->hd.stream_id)) {
       return session_inflate_handle_invalid_connection(
           session, frame, NGHTTP2_ERR_PROTO,
           "request HEADERS: invalid stream_id");
     }
 
+    stream = nghttp2_session_get_stream_raw(session, frame->hd.stream_id);
+    if (stream && (stream->shut_flags & NGHTTP2_SHUT_RD)) {
+      return session_inflate_handle_invalid_connection(
+          session, frame, NGHTTP2_ERR_STREAM_CLOSED, "HEADERS: stream closed");
+    }
+
     return NGHTTP2_ERR_IGN_HEADER_BLOCK;
   }
   session->last_recv_stream_id = frame->hd.stream_id;
 
-  if (session->goaway_flags & NGHTTP2_GOAWAY_SENT) {
-    /* We just ignore stream after GOAWAY was queued */
-    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
-  }
-
   if (session_is_incoming_concurrent_streams_max(session)) {
     return session_inflate_handle_invalid_connection(
         session, frame, NGHTTP2_ERR_PROTO,
         "request HEADERS: max concurrent streams exceeded");
   }
 
+  if (!session_allow_incoming_new_stream(session)) {
+    /* We just ignore stream after GOAWAY was sent */
+    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
+  }
+
   if (frame->headers.pri_spec.stream_id == frame->hd.stream_id) {
     return session_inflate_handle_invalid_connection(
         session, frame, NGHTTP2_ERR_PROTO, "request HEADERS: depend on itself");
@@ -3564,7 +3557,14 @@ int nghttp2_session_on_request_headers_received(nghttp2_session *session,
   if (!stream) {
     return NGHTTP2_ERR_NOMEM;
   }
+
+  rv = nghttp2_session_adjust_closed_stream(session);
+  if (nghttp2_is_fatal(rv)) {
+    return rv;
+  }
+
   session->last_proc_stream_id = session->last_recv_stream_id;
+
   rv = session_call_on_begin_headers(session, frame);
   if (rv != 0) {
     return rv;
@@ -3590,9 +3590,11 @@ int nghttp2_session_on_response_headers_received(nghttp2_session *session,
        If an endpoint receives additional frames for a stream that is
        in this state it MUST respond with a stream error (Section
        5.4.2) of type STREAM_CLOSED.
+
+       We go further, and make it connection error.
     */
-    return session_inflate_handle_invalid_stream(session, frame,
+    return session_inflate_handle_invalid_connection(
-                                                 NGHTTP2_ERR_STREAM_CLOSED);
+        session, frame, NGHTTP2_ERR_STREAM_CLOSED, "HEADERS: stream closed");
   }
   stream->state = NGHTTP2_STREAM_OPENED;
   rv = session_call_on_begin_headers(session, frame);
@@ -3612,9 +3614,11 @@ int nghttp2_session_on_push_response_headers_received(nghttp2_session *session,
         session, frame, NGHTTP2_ERR_PROTO,
         "push response HEADERS: stream_id == 0");
   }
-  if (session->goaway_flags) {
+
-    /* We don't accept new stream after GOAWAY is sent or received. */
+  if (session->server) {
-    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
+    return session_inflate_handle_invalid_connection(
+        session, frame, NGHTTP2_ERR_PROTO,
+        "HEADERS: no HEADERS allowed from client in reserved state");
   }
 
   if (session_is_incoming_concurrent_streams_max(session)) {
@@ -3622,6 +3626,12 @@ int nghttp2_session_on_push_response_headers_received(nghttp2_session *session,
         session, frame, NGHTTP2_ERR_PROTO,
         "push response HEADERS: max concurrent streams exceeded");
   }
+
+  if (!session_allow_incoming_new_stream(session)) {
+    /* We don't accept new stream after GOAWAY was sent. */
+    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
+  }
+
   if (session_is_incoming_concurrent_streams_pending_max(session)) {
     return session_inflate_handle_invalid_stream(session, frame,
                                                  NGHTTP2_ERR_REFUSED_STREAM);
@@ -3647,23 +3657,17 @@ int nghttp2_session_on_headers_received(nghttp2_session *session,
     return session_inflate_handle_invalid_connection(
         session, frame, NGHTTP2_ERR_PROTO, "HEADERS: stream_id == 0");
   }
-  if (stream->state == NGHTTP2_STREAM_RESERVED) {
-    /* reserved. The valid push response HEADERS is processed by
-       nghttp2_session_on_push_response_headers_received(). This
-       generic HEADERS is called invalid cases for HEADERS against
-       reserved state. */
-    return session_inflate_handle_invalid_connection(
-        session, frame, NGHTTP2_ERR_PROTO, "HEADERS: stream in reserved");
-  }
   if ((stream->shut_flags & NGHTTP2_SHUT_RD)) {
     /* half closed (remote): from the spec:
 
        If an endpoint receives additional frames for a stream that is
        in this state it MUST respond with a stream error (Section
        5.4.2) of type STREAM_CLOSED.
+
+       we go further, and make it connection error.
     */
-    return session_inflate_handle_invalid_stream(session, frame,
+    return session_inflate_handle_invalid_connection(
-                                                 NGHTTP2_ERR_STREAM_CLOSED);
+        session, frame, NGHTTP2_ERR_STREAM_CLOSED, "HEADERS: stream closed");
   }
   if (nghttp2_session_is_my_stream_id(session, frame->hd.stream_id)) {
     if (stream->state == NGHTTP2_STREAM_OPENED) {
@@ -3672,15 +3676,9 @@ int nghttp2_session_on_headers_received(nghttp2_session *session,
         return rv;
       }
       return 0;
-    } else if (stream->state == NGHTTP2_STREAM_CLOSING) {
-      /* This is race condition. NGHTTP2_STREAM_CLOSING indicates
-         that we queued RST_STREAM but it has not been sent. It will
-         eventually sent, so we just ignore this frame. */
-      return NGHTTP2_ERR_IGN_HEADER_BLOCK;
-    } else {
-      return session_inflate_handle_invalid_stream(session, frame,
-                                                   NGHTTP2_ERR_PROTO);
     }
+
+    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
   }
   /* If this is remote peer initiated stream, it is OK unless it
      has sent END_STREAM frame already. But if stream is in
@@ -3715,20 +3713,18 @@ static int session_process_headers_frame(nghttp2_session *session) {
     return nghttp2_session_on_request_headers_received(session, frame);
   }
 
-  if (nghttp2_session_is_my_stream_id(session, frame->hd.stream_id)) {
-    if (stream->state == NGHTTP2_STREAM_OPENING) {
-      frame->headers.cat = NGHTTP2_HCAT_RESPONSE;
-      return nghttp2_session_on_response_headers_received(session, frame,
-                                                          stream);
-    }
-    frame->headers.cat = NGHTTP2_HCAT_HEADERS;
-    return nghttp2_session_on_headers_received(session, frame, stream);
-  }
   if (stream->state == NGHTTP2_STREAM_RESERVED) {
     frame->headers.cat = NGHTTP2_HCAT_PUSH_RESPONSE;
     return nghttp2_session_on_push_response_headers_received(session, frame,
                                                              stream);
   }
+
+  if (stream->state == NGHTTP2_STREAM_OPENING &&
+      nghttp2_session_is_my_stream_id(session, frame->hd.stream_id)) {
+    frame->headers.cat = NGHTTP2_HCAT_RESPONSE;
+    return nghttp2_session_on_response_headers_received(session, frame, stream);
+  }
+
   frame->headers.cat = NGHTTP2_HCAT_HEADERS;
   return nghttp2_session_on_headers_received(session, frame, stream);
 }
@@ -3769,6 +3765,11 @@ int nghttp2_session_on_priority_received(nghttp2_session *session,
     if (stream == NULL) {
       return NGHTTP2_ERR_NOMEM;
     }
+
+    rv = nghttp2_session_adjust_idle_stream(session);
+    if (nghttp2_is_fatal(rv)) {
+      return rv;
+    }
   } else {
     rv = nghttp2_session_reprioritize_stream(session, stream,
                                              &frame->priority.pri_spec);
@@ -3776,6 +3777,11 @@ int nghttp2_session_on_priority_received(nghttp2_session *session,
     if (nghttp2_is_fatal(rv)) {
       return rv;
     }
+
+    rv = nghttp2_session_adjust_idle_stream(session);
+    if (nghttp2_is_fatal(rv)) {
+      return rv;
+    }
   }
 
   return session_call_on_frame_received(session, frame);
@@ -3805,6 +3811,9 @@ int nghttp2_session_on_rst_stream_received(nghttp2_session *session,
       return session_handle_invalid_connection(
           session, frame, NGHTTP2_ERR_PROTO, "RST_STREAM: stream in idle");
     }
+  } else {
+    /* We may use stream->shut_flags for strict error checking. */
+    nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
   }
 
   rv = session_call_on_frame_received(session, frame);
@@ -4220,17 +4229,17 @@ int nghttp2_session_on_push_promise_received(nghttp2_session *session,
     return session_inflate_handle_invalid_connection(
         session, frame, NGHTTP2_ERR_PROTO, "PUSH_PROMISE: push disabled");
   }
-  if (session->goaway_flags) {
-    /* We just dicard PUSH_PROMISE after GOAWAY is sent or
-       received. */
-    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
-  }
 
   if (!nghttp2_session_is_my_stream_id(session, frame->hd.stream_id)) {
     return session_inflate_handle_invalid_connection(
         session, frame, NGHTTP2_ERR_PROTO, "PUSH_PROMISE: invalid stream_id");
   }
 
+  if (!session_allow_incoming_new_stream(session)) {
+    /* We just discard PUSH_PROMISE after GOAWAY was sent */
+    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
+  }
+
   if (!session_is_new_peer_stream_id(session,
                                      frame->push_promise.promised_stream_id)) {
     /* The spec says if an endpoint receives a PUSH_PROMISE with
@@ -4251,7 +4260,11 @@ int nghttp2_session_on_push_promise_received(nghttp2_session *session,
         return session_inflate_handle_invalid_connection(
             session, frame, NGHTTP2_ERR_PROTO, "PUSH_PROMISE: stream in idle");
       }
+
+      /* Currently, client does not retain closed stream, so we don't
+         check NGHTTP2_SHUT_RD condition here. */
     }
+
     rv = nghttp2_session_add_rst_stream(
         session, frame->push_promise.promised_stream_id, NGHTTP2_CANCEL);
     if (rv != 0) {
@@ -4259,25 +4272,13 @@ int nghttp2_session_on_push_promise_received(nghttp2_session *session,
     }
     return NGHTTP2_ERR_IGN_HEADER_BLOCK;
   }
+
   if (stream->shut_flags & NGHTTP2_SHUT_RD) {
-    if (session->callbacks.on_invalid_frame_recv_callback) {
+    return session_inflate_handle_invalid_connection(
-      if (session->callbacks.on_invalid_frame_recv_callback(
+        session, frame, NGHTTP2_ERR_STREAM_CLOSED,
-              session, frame, NGHTTP2_PROTOCOL_ERROR, session->user_data) !=
+        "PUSH_PROMISE: stream closed");
-          0) {
-        return NGHTTP2_ERR_CALLBACK_FAILURE;
-      }
-    }
-    rv = nghttp2_session_add_rst_stream(session,
-                                        frame->push_promise.promised_stream_id,
-                                        NGHTTP2_PROTOCOL_ERROR);
-    if (rv != 0) {
-      return rv;
-    }
-    return NGHTTP2_ERR_IGN_HEADER_BLOCK;
   }
 
-  /* TODO It is unclear reserved stream dpeneds on associated
-     stream with or without exclusive flag set */
   nghttp2_priority_spec_init(&pri_spec, stream->stream_id,
                              NGHTTP2_DEFAULT_WEIGHT, 0);
 
@@ -4289,6 +4290,9 @@ int nghttp2_session_on_push_promise_received(nghttp2_session *session,
     return NGHTTP2_ERR_NOMEM;
   }
 
+  /* We don't call nghttp2_session_adjust_closed_stream(), since we
+     don't keep closed stream in client side */
+
   session->last_proc_stream_id = session->last_recv_stream_id;
   rv = session_call_on_begin_headers(session, frame);
   if (rv != 0) {
@@ -4392,8 +4396,9 @@ session_on_connection_window_update_received(nghttp2_session *session,
                                              nghttp2_frame *frame) {
   /* Handle connection-level flow control */
   if (frame->window_update.window_size_increment == 0) {
-    return session_handle_invalid_connection(session, frame, NGHTTP2_ERR_PROTO,
+    return session_handle_invalid_connection(
-                                             NULL);
+        session, frame, NGHTTP2_ERR_PROTO,
+        "WINDOW_UPDATE: window_size_increment == 0");
   }
 
   if (NGHTTP2_MAX_WINDOW_SIZE - frame->window_update.window_size_increment <
@@ -4423,7 +4428,9 @@ static int session_on_stream_window_update_received(nghttp2_session *session,
         session, frame, NGHTTP2_ERR_PROTO, "WINDOW_UPADATE to reserved stream");
   }
   if (frame->window_update.window_size_increment == 0) {
-    return session_handle_invalid_stream(session, frame, NGHTTP2_ERR_PROTO);
+    return session_handle_invalid_connection(
+        session, frame, NGHTTP2_ERR_PROTO,
+        "WINDOW_UPDATE: window_size_increment == 0");
   }
   if (NGHTTP2_MAX_WINDOW_SIZE - frame->window_update.window_size_increment <
       stream->remote_window_size) {
@@ -4736,6 +4743,14 @@ static int session_on_data_received_fail_fast(nghttp2_session *session) {
       error_code = NGHTTP2_PROTOCOL_ERROR;
       goto fail;
     }
+
+    stream = nghttp2_session_get_stream_raw(session, stream_id);
+    if (stream && (stream->shut_flags & NGHTTP2_SHUT_RD)) {
+      failure_reason = "DATA: stream closed";
+      error_code = NGHTTP2_STREAM_CLOSED;
+      goto fail;
+    }
+
     return NGHTTP2_ERR_IGN_PAYLOAD;
   }
   if (stream->shut_flags & NGHTTP2_SHUT_RD) {
@@ -4920,6 +4935,14 @@ ssize_t nghttp2_session_mem_recv(nghttp2_session *session, const uint8_t *in,
 
   mem = &session->mem;
 
+  /* We may have idle streams more than we expect (e.g.,
+     nghttp2_session_change_stream_priority() or
+     nghttp2_session_create_idle_stream()).  Adjust them here. */
+  rv = nghttp2_session_adjust_idle_stream(session);
+  if (nghttp2_is_fatal(rv)) {
+    return rv;
+  }
+
   for (;;) {
     switch (iframe->state) {
     case NGHTTP2_IB_READ_CLIENT_MAGIC:
@@ -6671,6 +6694,10 @@ static int nghttp2_session_upgrade_internal(nghttp2_session *session,
   if (stream == NULL) {
     return NGHTTP2_ERR_NOMEM;
   }
+
+  /* We don't call nghttp2_session_adjust_closed_stream(), since this
+     should be the first stream open. */
+
   if (session->server) {
     nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
     session->last_recv_stream_id = 1;
@@ -6885,6 +6912,7 @@ int nghttp2_session_check_server_session(nghttp2_session *session) {
 int nghttp2_session_change_stream_priority(
     nghttp2_session *session, int32_t stream_id,
     const nghttp2_priority_spec *pri_spec) {
+  int rv;
   nghttp2_stream *stream;
   nghttp2_priority_spec pri_spec_copy;
 
@@ -6900,7 +6928,18 @@ int nghttp2_session_change_stream_priority(
   pri_spec_copy = *pri_spec;
   nghttp2_priority_spec_normalize_weight(&pri_spec_copy);
 
-  return nghttp2_session_reprioritize_stream(session, stream, &pri_spec_copy);
+  rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec_copy);
+
+  if (nghttp2_is_fatal(rv)) {
+    return rv;
+  }
+
+  /* We don't intentionally call nghttp2_session_adjust_idle_stream()
+     so that idle stream created by this function, and existing ones
+     are kept for application.  We will adjust number of idle stream
+     in nghttp2_session_mem_send or nghttp2_session_mem_recv is
+     called. */
+  return 0;
 }
 
 int nghttp2_session_create_idle_stream(nghttp2_session *session,
@@ -6929,5 +6968,10 @@ int nghttp2_session_create_idle_stream(nghttp2_session *session,
     return NGHTTP2_ERR_NOMEM;
   }
 
+  /* We don't intentionally call nghttp2_session_adjust_idle_stream()
+     so that idle stream created by this function, and existing ones
+     are kept for application.  We will adjust number of idle stream
+     in nghttp2_session_mem_send or nghttp2_session_mem_recv is
+     called. */
   return 0;
 }

lib/nghttp2_session.h

@@ -73,6 +73,10 @@ typedef struct {
 /* The default maximum number of incoming reserved streams */
 #define NGHTTP2_MAX_INCOMING_RESERVED_STREAMS 200
 
+/* Even if we have less SETTINGS_MAX_CONCURRENT_STREAMS than this
+   number, we keep NGHTTP2_MIN_IDLE_STREAMS streams in idle state */
+#define NGHTTP2_MIN_IDLE_STREAMS 16
+
 /* The maximum number of items in outbound queue, which is considered
    as flooding caused by peer.  All frames are not considered here.
    We only consider PING + ACK and SETTINGS + ACK.  This is because
@@ -450,6 +454,11 @@ int nghttp2_session_add_settings(nghttp2_session *session, uint8_t flags,
  *
  * This function returns a pointer to created new stream object, or
  * NULL.
+ *
+ * This function adjusts neither the number of closed streams or idle
+ * streams.  The caller should manually call
+ * nghttp2_session_adjust_closed_stream() or
+ * nghttp2_session_adjust_idle_stream() respectively.
  */
 nghttp2_stream *nghttp2_session_open_stream(nghttp2_session *session,
                                             int32_t stream_id, uint8_t flags,
@@ -498,28 +507,16 @@ int nghttp2_session_destroy_stream(nghttp2_session *session,
  * limitation of maximum number of streams in memory, |stream| is not
  * closed and just deleted from memory (see
  * nghttp2_session_destroy_stream).
- *
- * This function returns 0 if it succeeds, or one the following
- * negative error codes:
- *
- * NGHTTP2_ERR_NOMEM
- *     Out of memory
  */
-int nghttp2_session_keep_closed_stream(nghttp2_session *session,
+void nghttp2_session_keep_closed_stream(nghttp2_session *session,
                                         nghttp2_stream *stream);
 
 /*
  * Appends |stream| to linked list |session->idle_stream_head|.  We
  * apply fixed limit for list size.  To fit into that limit, one or
  * more oldest streams are removed from list as necessary.
- *
- * This function returns 0 if it succeeds, or one the following
- * negative error codes:
- *
- * NGHTTP2_ERR_NOMEM
- *     Out of memory
  */
-int nghttp2_session_keep_idle_stream(nghttp2_session *session,
+void nghttp2_session_keep_idle_stream(nghttp2_session *session,
                                       nghttp2_stream *stream);
 
 /*
@@ -531,9 +528,7 @@ void nghttp2_session_detach_idle_stream(nghttp2_session *session,
 /*
  * Deletes closed stream to ensure that number of incoming streams
  * including active and closed is in the maximum number of allowed
- * stream.  If |offset| is nonzero, it is decreased from the maximum
+ * stream.
- * number of allowed stream when comparing number of active and closed
- * stream and the maximum number.
  *
  * This function returns 0 if it succeeds, or one the following
  * negative error codes:
@@ -541,8 +536,7 @@ void nghttp2_session_detach_idle_stream(nghttp2_session *session,
  * NGHTTP2_ERR_NOMEM
  *     Out of memory
  */
-int nghttp2_session_adjust_closed_stream(nghttp2_session *session,
+int nghttp2_session_adjust_closed_stream(nghttp2_session *session);
-                                         size_t offset);
 
 /*
  * Deletes idle stream to ensure that number of idle streams is in
@@ -814,6 +808,9 @@ int nghttp2_session_update_local_settings(nghttp2_session *session,
  * |pri_spec|.  Caller must ensure that stream->hd.stream_id !=
  * pri_spec->stream_id.
  *
+ * This function does not adjust the number of idle streams.  The
+ * caller should call nghttp2_session_adjust_idle_stream() later.
+ *
  * This function returns 0 if it succeeds, or one of the following
  * negative error codes:
  *

lib/nghttp2_stream.c

@@ -80,6 +80,7 @@ void nghttp2_stream_init(nghttp2_stream *stream, int32_t stream_id,
   stream->queued = 0;
   stream->descendant_last_cycle = 0;
   stream->cycle = 0;
+  stream->pending_penalty = 0;
   stream->descendant_next_seq = 0;
   stream->seq = 0;
   stream->last_writelen = 0;
@@ -115,9 +116,14 @@ static int stream_subtree_active(nghttp2_stream *stream) {
 /*
  * Returns next cycle for |stream|.
  */
-static uint64_t stream_next_cycle(nghttp2_stream *stream, uint64_t last_cycle) {
+static void stream_next_cycle(nghttp2_stream *stream, uint64_t last_cycle) {
-  return last_cycle +
+  size_t penalty;
-         stream->last_writelen * NGHTTP2_MAX_WEIGHT / (uint32_t)stream->weight;
+
+  penalty =
+      stream->last_writelen * NGHTTP2_MAX_WEIGHT + stream->pending_penalty;
+
+  stream->cycle = last_cycle + penalty / (uint32_t)stream->weight;
+  stream->pending_penalty = (uint32_t)(penalty % (uint32_t)stream->weight);
 }
 
 static int stream_obq_push(nghttp2_stream *dep_stream, nghttp2_stream *stream) {
@@ -125,7 +131,6 @@ static int stream_obq_push(nghttp2_stream *dep_stream, nghttp2_stream *stream) {
 
   for (; dep_stream && !stream->queued;
        stream = dep_stream, dep_stream = dep_stream->dep_prev) {
-    stream->cycle =
     stream_next_cycle(stream, dep_stream->descendant_last_cycle);
     stream->seq = dep_stream->descendant_next_seq++;
 
@@ -169,6 +174,7 @@ static void stream_obq_remove(nghttp2_stream *stream) {
 
     stream->queued = 0;
     stream->cycle = 0;
+    stream->pending_penalty = 0;
     stream->descendant_last_cycle = 0;
     stream->last_writelen = 0;
 
@@ -207,25 +213,12 @@ void nghttp2_stream_reschedule(nghttp2_stream *stream) {
   dep_stream = stream->dep_prev;
 
   for (; dep_stream; stream = dep_stream, dep_stream = dep_stream->dep_prev) {
-    if (nghttp2_pq_size(&dep_stream->obq) == 1) {
-      dep_stream->descendant_last_cycle = 0;
-      stream->cycle = 0;
-    } else {
-      /* We update descendant_last_cycle here, and we don't do it when
-         no data is written for stream.  This effectively means that
-         we treat these streams as if they are not scheduled at all.
-         This does not cause disruption in scheduling machinery.  It
-         just makes new streams scheduled a bit early. */
-      dep_stream->descendant_last_cycle = stream->cycle;
-
     nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
 
-      stream->cycle =
     stream_next_cycle(stream, dep_stream->descendant_last_cycle);
     stream->seq = dep_stream->descendant_next_seq++;
 
     nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
-    }
 
     DEBUGF(fprintf(stderr, "stream: stream=%d obq resched cycle=%ld\n",
                    stream->stream_id, stream->cycle));
@@ -234,6 +227,61 @@ void nghttp2_stream_reschedule(nghttp2_stream *stream) {
   }
 }
 
+void nghttp2_stream_change_weight(nghttp2_stream *stream, int32_t weight) {
+  nghttp2_stream *dep_stream;
+  uint64_t last_cycle;
+  int32_t old_weight;
+  size_t wlen_penalty;
+
+  if (stream->weight == weight) {
+    return;
+  }
+
+  old_weight = stream->weight;
+  stream->weight = weight;
+
+  dep_stream = stream->dep_prev;
+
+  if (!dep_stream) {
+    return;
+  }
+
+  dep_stream->sum_dep_weight += weight - old_weight;
+
+  if (!stream->queued) {
+    return;
+  }
+
+  nghttp2_pq_remove(&dep_stream->obq, &stream->pq_entry);
+
+  wlen_penalty = stream->last_writelen * NGHTTP2_MAX_WEIGHT;
+
+  /* Compute old stream->pending_penalty we used to calculate
+     stream->cycle */
+  stream->pending_penalty =
+      (uint32_t)((stream->pending_penalty + (uint32_t)old_weight -
+                  (wlen_penalty % (uint32_t)old_weight)) %
+                 (uint32_t)old_weight);
+
+  last_cycle = stream->cycle -
+               (wlen_penalty + stream->pending_penalty) / (uint32_t)old_weight;
+
+  /* Now we have old stream->pending_penalty and new stream->weight in
+     place */
+  stream_next_cycle(stream, last_cycle);
+
+  if (stream->cycle < dep_stream->descendant_last_cycle) {
+    stream->cycle = dep_stream->descendant_last_cycle;
+  }
+
+  /* Continue to use same stream->seq */
+
+  nghttp2_pq_push(&dep_stream->obq, &stream->pq_entry);
+
+  DEBUGF(fprintf(stderr, "stream: stream=%d obq resched cycle=%ld\n",
+                 stream->stream_id, stream->cycle));
+}
+
 static nghttp2_stream *stream_last_sib(nghttp2_stream *stream) {
   for (; stream->sib_next; stream = stream->sib_next)
     ;
@@ -861,9 +909,15 @@ int nghttp2_stream_in_dep_tree(nghttp2_stream *stream) {
 nghttp2_outbound_item *
 nghttp2_stream_next_outbound_item(nghttp2_stream *stream) {
   nghttp2_pq_entry *ent;
+  nghttp2_stream *si;
 
   for (;;) {
     if (stream_active(stream)) {
+      /* Update ascendant's descendant_last_cycle here, so that we can
+         assure that new stream is scheduled based on it. */
+      for (si = stream; si->dep_prev; si = si->dep_prev) {
+        si->dep_prev->descendant_last_cycle = si->cycle;
+      }
       return stream->item;
     }
     ent = nghttp2_pq_top(&stream->obq);

lib/nghttp2_stream.h

@@ -197,6 +197,8 @@ struct nghttp2_stream {
   int32_t local_window_size;
   /* weight of this stream */
   int32_t weight;
+  /* This is unpaid penalty (offset) when calculating cycle. */
+  uint32_t pending_penalty;
   /* sum of weight of direct descendants */
   int32_t sum_dep_weight;
   nghttp2_stream_state state;
@@ -419,7 +421,14 @@ int nghttp2_stream_in_dep_tree(nghttp2_stream *stream);
 void nghttp2_stream_reschedule(nghttp2_stream *stream);
 
 /*
- * Returns a stream which has highest priority.
+ * Changes |stream|'s weight to |weight|.  If |stream| is queued, it
+ * will be rescheduled based on new weight.
+ */
+void nghttp2_stream_change_weight(nghttp2_stream *stream, int32_t weight);
+
+/*
+ * Returns a stream which has highest priority, updating
+ * descendant_last_cycle of selected stream's ancestors.
  */
 nghttp2_outbound_item *
 nghttp2_stream_next_outbound_item(nghttp2_stream *stream);

lib/nghttp2_submit.c

@@ -40,8 +40,7 @@ static int32_t submit_headers_shared(nghttp2_session *session, uint8_t flags,
                                      const nghttp2_priority_spec *pri_spec,
                                      nghttp2_nv *nva_copy, size_t nvlen,
                                      const nghttp2_data_provider *data_prd,
-                                     void *stream_user_data,
+                                     void *stream_user_data) {
-                                     uint8_t attach_stream) {
   int rv;
   uint8_t flags_copy;
   nghttp2_outbound_item *item = NULL;
@@ -56,6 +55,16 @@ static int32_t submit_headers_shared(nghttp2_session *session, uint8_t flags,
     goto fail;
   }
 
+  if (stream_id == -1) {
+    if ((int32_t)session->next_stream_id == pri_spec->stream_id) {
+      rv = NGHTTP2_ERR_INVALID_ARGUMENT;
+      goto fail;
+    }
+  } else if (stream_id == pri_spec->stream_id) {
+    rv = NGHTTP2_ERR_INVALID_ARGUMENT;
+    goto fail;
+  }
+
   item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
   if (item == NULL) {
     rv = NGHTTP2_ERR_NOMEM;
@@ -69,7 +78,6 @@ static int32_t submit_headers_shared(nghttp2_session *session, uint8_t flags,
   }
 
   item->aux_data.headers.stream_user_data = stream_user_data;
-  item->aux_data.headers.attach_stream = attach_stream;
 
   flags_copy =
       (uint8_t)((flags & (NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_PRIORITY)) |
@@ -122,8 +130,7 @@ static int32_t submit_headers_shared_nva(nghttp2_session *session,
                                          const nghttp2_priority_spec *pri_spec,
                                          const nghttp2_nv *nva, size_t nvlen,
                                          const nghttp2_data_provider *data_prd,
-                                         void *stream_user_data,
+                                         void *stream_user_data) {
-                                         uint8_t attach_stream) {
   int rv;
   nghttp2_nv *nva_copy;
   nghttp2_priority_spec copy_pri_spec;
@@ -144,15 +151,14 @@ static int32_t submit_headers_shared_nva(nghttp2_session *session,
   }
 
   return submit_headers_shared(session, flags, stream_id, &copy_pri_spec,
-                               nva_copy, nvlen, data_prd, stream_user_data,
+                               nva_copy, nvlen, data_prd, stream_user_data);
-                               attach_stream);
 }
 
 int nghttp2_submit_trailer(nghttp2_session *session, int32_t stream_id,
                            const nghttp2_nv *nva, size_t nvlen) {
   return (int)submit_headers_shared_nva(session, NGHTTP2_FLAG_END_STREAM,
-                                        stream_id, NULL, nva, nvlen, NULL, NULL,
+                                        stream_id, NULL, nva, nvlen, NULL,
-                                        0);
+                                        NULL);
 }
 
 int32_t nghttp2_submit_headers(nghttp2_session *session, uint8_t flags,
@@ -169,7 +175,7 @@ int32_t nghttp2_submit_headers(nghttp2_session *session, uint8_t flags,
   }
 
   return submit_headers_shared_nva(session, flags, stream_id, pri_spec, nva,
-                                   nvlen, NULL, stream_user_data, 0);
+                                   nvlen, NULL, stream_user_data);
 }
 
 int nghttp2_submit_ping(nghttp2_session *session, uint8_t flags _U_,
@@ -398,7 +404,7 @@ int32_t nghttp2_submit_request(nghttp2_session *session,
   flags = set_request_flags(pri_spec, data_prd);
 
   return submit_headers_shared_nva(session, flags, -1, pri_spec, nva, nvlen,
-                                   data_prd, stream_user_data, 0);
+                                   data_prd, stream_user_data);
 }
 
 static uint8_t set_response_flags(const nghttp2_data_provider *data_prd) {
@@ -414,7 +420,7 @@ int nghttp2_submit_response(nghttp2_session *session, int32_t stream_id,
                             const nghttp2_data_provider *data_prd) {
   uint8_t flags = set_response_flags(data_prd);
   return submit_headers_shared_nva(session, flags, stream_id, NULL, nva, nvlen,
-                                   data_prd, NULL, 1);
+                                   data_prd, NULL);
 }
 
 int nghttp2_submit_data(nghttp2_session *session, uint8_t flags,

src/HttpServer.cc

@@ -53,6 +53,7 @@
 #include <deque>
 
 #include <openssl/err.h>
+#include <openssl/dh.h>
 
 #include <zlib.h>
 
@@ -105,7 +106,7 @@ Config::Config()
       max_concurrent_streams(100), header_table_size(-1), port(0),
       verbose(false), daemon(false), verify_client(false), no_tls(false),
       error_gzip(false), early_response(false), hexdump(false),
-      echo_upload(false) {}
+      echo_upload(false), no_content_length(false) {}
 
 Config::~Config() {}
 
@@ -872,12 +873,14 @@ int Http2Handler::submit_file_response(const std::string &status,
   std::string last_modified_str;
   auto nva = make_array(http2::make_nv_ls(":status", status),
                         http2::make_nv_ll("server", NGHTTPD_SERVER),
-                        http2::make_nv_ls("content-length", content_length),
                         http2::make_nv_ll("cache-control", "max-age=3600"),
                         http2::make_nv_ls("date", sessions_->get_cached_date()),
                         http2::make_nv_ll("", ""), http2::make_nv_ll("", ""),
-                        http2::make_nv_ll("", ""));
+                        http2::make_nv_ll("", ""), http2::make_nv_ll("", ""));
-  size_t nvlen = 5;
+  size_t nvlen = 4;
+  if (!get_config()->no_content_length) {
+    nva[nvlen++] = http2::make_nv_ls("content-length", content_length);
+  }
   if (last_modified != 0) {
     last_modified_str = util::http_date(last_modified);
     nva[nvlen++] = http2::make_nv_ls("last-modified", last_modified_str);
@@ -1087,7 +1090,9 @@ void prepare_echo_response(Stream *stream, Http2Handler *hd) {
 
   Headers headers;
   headers.emplace_back("nghttpd-response", "echo");
+  if (!hd->get_config()->no_content_length) {
     headers.emplace_back("content-length", util::utos(length));
+  }
 
   hd->submit_response("200", stream->stream_id, headers, &data_prd);
 }

src/HttpServer.h

@@ -76,6 +76,7 @@ struct Config {
   bool early_response;
   bool hexdump;
   bool echo_upload;
+  bool no_content_length;
   Config();
   ~Config();
 };

src/asio_client_session.cc

@@ -39,12 +39,16 @@ using boost::asio::ip::tcp;
 
 session::session(boost::asio::io_service &io_service, const std::string &host,
                  const std::string &service)
-    : impl_(make_unique<session_tcp_impl>(io_service, host, service)) {}
+    : impl_(std::make_shared<session_tcp_impl>(io_service, host, service)) {
+  impl_->start_resolve(host, service);
+}
 
 session::session(boost::asio::io_service &io_service,
                  boost::asio::ssl::context &tls_ctx, const std::string &host,
                  const std::string &service)
-    : impl_(make_unique<session_tls_impl>(io_service, tls_ctx, host, service)) {
+    : impl_(std::make_shared<session_tls_impl>(io_service, tls_ctx, host,
+                                               service)) {
+  impl_->start_resolve(host, service);
 }
 
 session::~session() {}
@@ -93,6 +97,14 @@ const request *session::submit(boost::system::error_code &ec,
   return impl_->submit(ec, method, uri, std::move(cb), std::move(h));
 }
 
+void session::connect_timeout(const boost::posix_time::time_duration &t) {
+  impl_->connect_timeout(t);
+}
+
+void session::read_timeout(const boost::posix_time::time_duration &t) {
+  impl_->read_timeout(t);
+}
+
 } // namespace client
 } // namespace asio_http2
 } // nghttp2

src/asio_client_session_impl.cc

@@ -40,8 +40,10 @@ namespace client {
 
 session_impl::session_impl(boost::asio::io_service &io_service)
     : wblen_(0), io_service_(io_service), resolver_(io_service),
-      session_(nullptr), data_pending_(nullptr), data_pendinglen_(0),
+      deadline_(io_service), connect_timeout_(boost::posix_time::seconds(60)),
-      writing_(false), inside_callback_(false) {}
+      read_timeout_(boost::posix_time::seconds(60)), session_(nullptr),
+      data_pending_(nullptr), data_pendinglen_(0), writing_(false),
+      inside_callback_(false), stopped_(false) {}
 
 session_impl::~session_impl() {
   // finish up all active stream
@@ -56,8 +58,12 @@ session_impl::~session_impl() {
 
 void session_impl::start_resolve(const std::string &host,
                                  const std::string &service) {
+  deadline_.expires_from_now(connect_timeout_);
+
+  auto self = this->shared_from_this();
+
   resolver_.async_resolve({host, service},
-                          [this](const boost::system::error_code &ec,
+                          [this, self](const boost::system::error_code &ec,
                                        tcp::resolver::iterator endpoint_it) {
                             if (ec) {
                               not_connected(ec);
@@ -66,6 +72,25 @@ void session_impl::start_resolve(const std::string &host,
 
                             start_connect(endpoint_it);
                           });
+
+  deadline_.async_wait(std::bind(&session_impl::handle_deadline, self));
+}
+
+void session_impl::handle_deadline() {
+  if (stopped_) {
+    return;
+  }
+
+  if (deadline_.expires_at() <=
+      boost::asio::deadline_timer::traits_type::now()) {
+    call_error_cb(boost::asio::error::timed_out);
+    stop();
+    deadline_.expires_at(boost::posix_time::pos_infin);
+    return;
+  }
+
+  deadline_.async_wait(
+      std::bind(&session_impl::handle_deadline, this->shared_from_this()));
 }
 
 void session_impl::connected(tcp::resolver::iterator endpoint_it) {
@@ -86,6 +111,7 @@ void session_impl::connected(tcp::resolver::iterator endpoint_it) {
 
 void session_impl::not_connected(const boost::system::error_code &ec) {
   call_error_cb(ec);
+  stop();
 }
 
 void session_impl::on_connect(connect_cb cb) { connect_cb_ = std::move(cb); }
@@ -97,6 +123,9 @@ const connect_cb &session_impl::on_connect() const { return connect_cb_; }
 const error_cb &session_impl::on_error() const { return error_cb_; }
 
 void session_impl::call_error_cb(const boost::system::error_code &ec) {
+  if (stopped_) {
+    return;
+  }
   auto &error_cb = on_error();
   if (!error_cb) {
     return;
@@ -350,12 +379,20 @@ int session_impl::write_trailer(stream &strm, header_map h) {
 }
 
 void session_impl::cancel(stream &strm, uint32_t error_code) {
+  if (stopped_) {
+    return;
+  }
+
   nghttp2_submit_rst_stream(session_, NGHTTP2_FLAG_NONE, strm.stream_id(),
                             error_code);
   signal_write();
 }
 
 void session_impl::resume(stream &strm) {
+  if (stopped_) {
+    return;
+  }
+
   nghttp2_session_resume_data(session_, strm.stream_id());
   signal_write();
 }
@@ -396,6 +433,11 @@ const request *session_impl::submit(boost::system::error_code &ec,
                                     header_map h) {
   ec.clear();
 
+  if (stopped_) {
+    ec = make_error_code(static_cast<nghttp2_error>(NGHTTP2_INTERNAL_ERROR));
+    return nullptr;
+  }
+
   http_parser_url u{};
   // TODO Handle CONNECT method
   if (http_parser_parse_url(uri.c_str(), uri.size(), 0, &u) != 0) {
@@ -485,6 +527,10 @@ const request *session_impl::submit(boost::system::error_code &ec,
 }
 
 void session_impl::shutdown() {
+  if (stopped_) {
+    return;
+  }
+
   nghttp2_session_terminate_session(session_, NGHTTP2_NO_ERROR);
   signal_write();
 }
@@ -522,13 +568,21 @@ void session_impl::leave_callback() {
 }
 
 void session_impl::do_read() {
-  read_socket([this](const boost::system::error_code &ec,
+  if (stopped_) {
+    return;
+  }
+
+  deadline_.expires_from_now(read_timeout_);
+
+  auto self = this->shared_from_this();
+
+  read_socket([this, self](const boost::system::error_code &ec,
                            std::size_t bytes_transferred) {
     if (ec) {
       if (!should_stop()) {
         call_error_cb(ec);
-        shutdown_socket();
       }
+      stop();
       return;
     }
 
@@ -541,7 +595,7 @@ void session_impl::do_read() {
       if (rv != static_cast<ssize_t>(bytes_transferred)) {
         call_error_cb(make_error_code(
             static_cast<nghttp2_error>(rv < 0 ? rv : NGHTTP2_ERR_PROTO)));
-        shutdown_socket();
+        stop();
         return;
       }
     }
@@ -549,7 +603,7 @@ void session_impl::do_read() {
     do_write();
 
     if (should_stop()) {
-      shutdown_socket();
+      stop();
       return;
     }
 
@@ -558,6 +612,10 @@ void session_impl::do_read() {
 }
 
 void session_impl::do_write() {
+  if (stopped_) {
+    return;
+  }
+
   if (writing_) {
     return;
   }
@@ -579,7 +637,7 @@ void session_impl::do_write() {
       auto n = nghttp2_session_mem_send(session_, &data);
       if (n < 0) {
         call_error_cb(make_error_code(static_cast<nghttp2_error>(n)));
-        shutdown_socket();
+        stop();
         return;
       }
 
@@ -601,15 +659,25 @@ void session_impl::do_write() {
   }
 
   if (wblen_ == 0) {
+    if (should_stop()) {
+      stop();
+    }
     return;
   }
 
   writing_ = true;
 
-  write_socket([this](const boost::system::error_code &ec, std::size_t n) {
+  // Reset read deadline here, because normally client is sending
+  // something, it does not expect timeout while doing it.
+  deadline_.expires_from_now(read_timeout_);
+
+  auto self = this->shared_from_this();
+
+  write_socket(
+      [this, self](const boost::system::error_code &ec, std::size_t n) {
         if (ec) {
           call_error_cb(ec);
-      shutdown_socket();
+          stop();
           return;
         }
 
@@ -620,6 +688,24 @@ void session_impl::do_write() {
       });
 }
 
+void session_impl::stop() {
+  if (stopped_) {
+    return;
+  }
+
+  shutdown_socket();
+  deadline_.cancel();
+  stopped_ = true;
+}
+
+void session_impl::connect_timeout(const boost::posix_time::time_duration &t) {
+  connect_timeout_ = t;
+}
+
+void session_impl::read_timeout(const boost::posix_time::time_duration &t) {
+  read_timeout_ = t;
+}
+
 } // namespace client
 } // namespace asio_http2
 } // nghttp2

src/asio_client_session_impl.h

@@ -41,7 +41,7 @@ class stream;
 
 using boost::asio::ip::tcp;
 
-class session_impl {
+class session_impl : public std::enable_shared_from_this<session_impl> {
 public:
   session_impl(boost::asio::io_service &io_service);
   virtual ~session_impl();
@@ -91,6 +91,11 @@ public:
   void do_read();
   void do_write();
 
+  void connect_timeout(const boost::posix_time::time_duration &t);
+  void read_timeout(const boost::posix_time::time_duration &t);
+
+  void stop();
+
 protected:
   boost::array<uint8_t, 8_k> rb_;
   boost::array<uint8_t, 64_k> wb_;
@@ -100,6 +105,7 @@ private:
   bool should_stop() const;
   bool setup_session();
   void call_error_cb(const boost::system::error_code &ec);
+  void handle_deadline();
 
   boost::asio::io_service &io_service_;
   tcp::resolver resolver_;
@@ -109,6 +115,10 @@ private:
   connect_cb connect_cb_;
   error_cb error_cb_;
 
+  boost::asio::deadline_timer deadline_;
+  boost::posix_time::time_duration connect_timeout_;
+  boost::posix_time::time_duration read_timeout_;
+
   nghttp2_session *session_;
 
   const uint8_t *data_pending_;
@@ -116,6 +126,7 @@ private:
 
   bool writing_;
   bool inside_callback_;
+  bool stopped_;
 };
 
 } // namespace client

src/asio_client_session_tcp_impl.cc

@@ -31,9 +31,7 @@ namespace client {
 session_tcp_impl::session_tcp_impl(boost::asio::io_service &io_service,
                                    const std::string &host,
                                    const std::string &service)
-    : session_impl(io_service), socket_(io_service) {
+    : session_impl(io_service), socket_(io_service) {}
-  start_resolve(host, service);
-}
 
 session_tcp_impl::~session_tcp_impl() {}
 
@@ -62,7 +60,10 @@ void session_tcp_impl::write_socket(
   boost::asio::async_write(socket_, boost::asio::buffer(wb_, wblen_), h);
 }
 
-void session_tcp_impl::shutdown_socket() { socket_.close(); }
+void session_tcp_impl::shutdown_socket() {
+  boost::system::error_code ignored_ec;
+  socket_.close(ignored_ec);
+}
 
 } // namespace client
 } // namespace asio_http2

src/asio_client_session_tls_impl.cc

@@ -38,8 +38,6 @@ session_tls_impl::session_tls_impl(boost::asio::io_service &io_service,
   // ssl::context::set_verify_mode(boost::asio::ssl::verify_peer) is
   // not used, which is what we want.
   socket_.set_verify_callback(boost::asio::ssl::rfc2818_verification(host));
-
-  start_resolve(host, service);
 }
 
 session_tls_impl::~session_tls_impl() {}
@@ -85,7 +83,8 @@ void session_tls_impl::write_socket(
 }
 
 void session_tls_impl::shutdown_socket() {
-  socket_.async_shutdown([](const boost::system::error_code &ec) {});
+  boost::system::error_code ignored_ec;
+  socket_.lowest_layer().close(ignored_ec);
 }
 
 } // namespace client

src/asio_io_service_pool.cc

@@ -92,6 +92,11 @@ boost::asio::io_service &io_service_pool::get_io_service() {
   return io_service;
 }
 
+const std::vector<std::shared_ptr<boost::asio::io_service>> &
+io_service_pool::io_services() const {
+  return io_services_;
+}
+
 } // namespace asio_http2
 
 } // namespace nghttp2

src/asio_io_service_pool.h

@@ -70,6 +70,10 @@ public:
   /// Get an io_service to use.
   boost::asio::io_service &get_io_service();
 
+  /// Get access to all io_service objects.
+  const std::vector<std::shared_ptr<boost::asio::io_service>> &
+  io_services() const;
+
 private:
   /// The pool of io_services.
   std::vector<std::shared_ptr<boost::asio::io_service>> io_services_;

src/asio_server.cc

@@ -44,8 +44,12 @@ namespace nghttp2 {
 namespace asio_http2 {
 namespace server {
 
-server::server(std::size_t io_service_pool_size)
+server::server(std::size_t io_service_pool_size,
-    : io_service_pool_(io_service_pool_size) {}
+               const boost::posix_time::time_duration &tls_handshake_timeout,
+               const boost::posix_time::time_duration &read_timeout)
+    : io_service_pool_(io_service_pool_size),
+      tls_handshake_timeout_(tls_handshake_timeout),
+      read_timeout_(read_timeout) {}
 
 boost::system::error_code
 server::listen_and_serve(boost::system::error_code &ec,
@@ -121,7 +125,8 @@ boost::system::error_code server::bind_and_listen(boost::system::error_code &ec,
 void server::start_accept(boost::asio::ssl::context &tls_context,
                           tcp::acceptor &acceptor, serve_mux &mux) {
   auto new_connection = std::make_shared<connection<ssl_socket>>(
-      mux, io_service_pool_.get_io_service(), tls_context);
+      mux, tls_handshake_timeout_, read_timeout_,
+      io_service_pool_.get_io_service(), tls_context);
 
   acceptor.async_accept(
       new_connection->socket().lowest_layer(),
@@ -130,14 +135,17 @@ void server::start_accept(boost::asio::ssl::context &tls_context,
         if (!e) {
           new_connection->socket().lowest_layer().set_option(
               tcp::no_delay(true));
+          new_connection->start_tls_handshake_deadline();
           new_connection->socket().async_handshake(
               boost::asio::ssl::stream_base::server,
               [new_connection](const boost::system::error_code &e) {
                 if (e) {
+                  new_connection->stop();
                   return;
                 }
 
                 if (!tls_h2_negotiated(new_connection->socket())) {
+                  new_connection->stop();
                   return;
                 }
 
@@ -151,13 +159,15 @@ void server::start_accept(boost::asio::ssl::context &tls_context,
 
 void server::start_accept(tcp::acceptor &acceptor, serve_mux &mux) {
   auto new_connection = std::make_shared<connection<tcp::socket>>(
-      mux, io_service_pool_.get_io_service());
+      mux, tls_handshake_timeout_, read_timeout_,
+      io_service_pool_.get_io_service());
 
   acceptor.async_accept(
       new_connection->socket(), [this, &acceptor, &mux, new_connection](
                                     const boost::system::error_code &e) {
         if (!e) {
           new_connection->socket().set_option(tcp::no_delay(true));
+          new_connection->start_read_deadline();
           new_connection->start();
         }
 
@@ -169,6 +179,11 @@ void server::stop() { io_service_pool_.stop(); }
 
 void server::join() { io_service_pool_.join(); }
 
+const std::vector<std::shared_ptr<boost::asio::io_service>> &
+server::io_services() const {
+  return io_service_pool_.io_services();
+}
+
 } // namespace server
 } // namespace asio_http2
 } // namespace nghttp2

src/asio_server.h

@@ -63,7 +63,9 @@ using ssl_socket = boost::asio::ssl::stream<tcp::socket>;
 
 class server : private boost::noncopyable {
 public:
-  explicit server(std::size_t io_service_pool_size);
+  explicit server(std::size_t io_service_pool_size,
+                  const boost::posix_time::time_duration &tls_handshake_timeout,
+                  const boost::posix_time::time_duration &read_timeout);
 
   boost::system::error_code
   listen_and_serve(boost::system::error_code &ec,
@@ -73,6 +75,10 @@ public:
   void join();
   void stop();
 
+  /// Get access to all io_service objects.
+  const std::vector<std::shared_ptr<boost::asio::io_service>> &
+  io_services() const;
+
 private:
   /// Initiate an asynchronous accept operation.
   void start_accept(tcp::acceptor &acceptor, serve_mux &mux);
@@ -94,6 +100,9 @@ private:
   std::vector<tcp::acceptor> acceptors_;
 
   std::unique_ptr<boost::asio::ssl::context> ssl_ctx_;
+
+  boost::posix_time::time_duration tls_handshake_timeout_;
+  boost::posix_time::time_duration read_timeout_;
 };
 
 } // namespace server

src/asio_server_connection.h

@@ -64,15 +64,23 @@ class connection : public std::enable_shared_from_this<connection<socket_type>>,
 public:
   /// Construct a connection with the given io_service.
   template <typename... SocketArgs>
-  explicit connection(serve_mux &mux, SocketArgs &&... args)
+  explicit connection(
-      : socket_(std::forward<SocketArgs>(args)...), mux_(mux), writing_(false) {
+      serve_mux &mux,
-  }
+      const boost::posix_time::time_duration &tls_handshake_timeout,
+      const boost::posix_time::time_duration &read_timeout,
+      SocketArgs &&... args)
+      : socket_(std::forward<SocketArgs>(args)...), mux_(mux),
+        deadline_(socket_.get_io_service()),
+        tls_handshake_timeout_(tls_handshake_timeout),
+        read_timeout_(read_timeout), writing_(false), stopped_(false) {}
 
   /// Start the first asynchronous operation for the connection.
   void start() {
-    handler_ = std::make_shared<http2_handler>(socket_.get_io_service(),
+    handler_ = std::make_shared<http2_handler>(
+        socket_.get_io_service(), socket_.lowest_layer().remote_endpoint(),
         [this]() { do_write(); }, mux_);
     if (handler_->start() != 0) {
+      stop();
       return;
     }
     do_read();
@@ -80,26 +88,61 @@ public:
 
   socket_type &socket() { return socket_; }
 
+  void start_tls_handshake_deadline() {
+    deadline_.expires_from_now(tls_handshake_timeout_);
+    deadline_.async_wait(
+        std::bind(&connection::handle_deadline, this->shared_from_this()));
+  }
+
+  void start_read_deadline() {
+    deadline_.expires_from_now(read_timeout_);
+    deadline_.async_wait(
+        std::bind(&connection::handle_deadline, this->shared_from_this()));
+  }
+
+  void handle_deadline() {
+    if (stopped_) {
+      return;
+    }
+
+    if (deadline_.expires_at() <=
+        boost::asio::deadline_timer::traits_type::now()) {
+      stop();
+      deadline_.expires_at(boost::posix_time::pos_infin);
+      return;
+    }
+
+    deadline_.async_wait(
+        std::bind(&connection::handle_deadline, this->shared_from_this()));
+  }
+
   void do_read() {
     auto self = this->shared_from_this();
 
+    deadline_.expires_from_now(read_timeout_);
+
     socket_.async_read_some(
         boost::asio::buffer(buffer_),
         [this, self](const boost::system::error_code &e,
                      std::size_t bytes_transferred) {
-          if (!e) {
+          if (e) {
+            stop();
+            return;
+          }
+
           if (handler_->on_read(buffer_, bytes_transferred) != 0) {
+            stop();
             return;
           }
 
           do_write();
 
           if (!writing_ && handler_->should_stop()) {
+            stop();
             return;
           }
 
           do_read();
-          }
 
           // If an error occurs then no new asynchronous operations are
           // started. This means that all shared_ptr references to the
@@ -122,23 +165,34 @@ public:
     rv = handler_->on_write(outbuf_, nwrite);
 
     if (rv != 0) {
+      stop();
       return;
     }
 
     if (nwrite == 0) {
+      if (handler_->should_stop()) {
+        stop();
+      }
       return;
     }
 
     writing_ = true;
 
+    // Reset read deadline here, because normally client is sending
+    // something, it does not expect timeout while doing it.
+    deadline_.expires_from_now(read_timeout_);
+
     boost::asio::async_write(
         socket_, boost::asio::buffer(outbuf_, nwrite),
         [this, self](const boost::system::error_code &e, std::size_t) {
-          if (!e) {
+          if (e) {
+            stop();
+            return;
+          }
+
           writing_ = false;
 
           do_write();
-          }
         });
 
     // No new asynchronous operations are started. This means that all
@@ -147,6 +201,17 @@ public:
     // returns. The connection class's destructor closes the socket.
   }
 
+  void stop() {
+    if (stopped_) {
+      return;
+    }
+
+    stopped_ = true;
+    boost::system::error_code ignored_ec;
+    socket_.lowest_layer().close(ignored_ec);
+    deadline_.cancel();
+  }
+
 private:
   socket_type socket_;
 
@@ -159,7 +224,12 @@ private:
 
   boost::array<uint8_t, 64_k> outbuf_;
 
+  boost::asio::deadline_timer deadline_;
+  boost::posix_time::time_duration tls_handshake_timeout_;
+  boost::posix_time::time_duration read_timeout_;
+
   bool writing_;
+  bool stopped_;
 };
 
 } // namespace server

src/asio_server_http2.cc

@@ -69,6 +69,14 @@ void http2::num_threads(size_t num_threads) { impl_->num_threads(num_threads); }
 
 void http2::backlog(int backlog) { impl_->backlog(backlog); }
 
+void http2::tls_handshake_timeout(const boost::posix_time::time_duration &t) {
+  impl_->tls_handshake_timeout(t);
+}
+
+void http2::read_timeout(const boost::posix_time::time_duration &t) {
+  impl_->read_timeout(t);
+}
+
 bool http2::handle(std::string pattern, request_cb cb) {
   return impl_->handle(std::move(pattern), std::move(cb));
 }
@@ -77,6 +85,11 @@ void http2::stop() { impl_->stop(); }
 
 void http2::join() { return impl_->join(); }
 
+const std::vector<std::shared_ptr<boost::asio::io_service>> &
+http2::io_services() const {
+  return impl_->io_services();
+}
+
 } // namespace server
 
 } // namespace asio_http2

src/asio_server_http2_handler.cc

@@ -136,6 +136,9 @@ int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
       break;
     }
 
+    auto &req = strm->request().impl();
+    req.remote_endpoint(handler->remote_endpoint());
+
     handler->call_on_request(*strm);
 
     if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
@@ -225,8 +228,9 @@ int on_frame_not_send_callback(nghttp2_session *session,
 } // namespace
 
 http2_handler::http2_handler(boost::asio::io_service &io_service,
+                             boost::asio::ip::tcp::endpoint ep,
                              connection_write writefun, serve_mux &mux)
-    : writefun_(writefun), mux_(mux), io_service_(io_service),
+    : writefun_(writefun), mux_(mux), io_service_(io_service), remote_ep_(ep),
       session_(nullptr), buf_(nullptr), buflen_(0), inside_callback_(false),
       tstamp_cached_(time(nullptr)),
       formatted_date_(util::http_date(tstamp_cached_)) {}
@@ -449,6 +453,10 @@ response *http2_handler::push_promise(boost::system::error_code &ec,
 
 boost::asio::io_service &http2_handler::io_service() { return io_service_; }
 
+const boost::asio::ip::tcp::endpoint &http2_handler::remote_endpoint() {
+  return remote_ep_;
+}
+
 callback_guard::callback_guard(http2_handler &h) : handler(h) {
   handler.enter_callback();
 }

src/asio_server_http2_handler.h

@@ -53,7 +53,8 @@ using connection_write = std::function<void(void)>;
 
 class http2_handler : public std::enable_shared_from_this<http2_handler> {
 public:
-  http2_handler(boost::asio::io_service &io_service, connection_write writefun,
+  http2_handler(boost::asio::io_service &io_service,
+                boost::asio::ip::tcp::endpoint ep, connection_write writefun,
                 serve_mux &mux);
 
   ~http2_handler();
@@ -89,6 +90,8 @@ public:
 
   boost::asio::io_service &io_service();
 
+  const boost::asio::ip::tcp::endpoint &remote_endpoint();
+
   const std::string &http_date();
 
   template <size_t N>
@@ -152,6 +155,7 @@ private:
   connection_write writefun_;
   serve_mux &mux_;
   boost::asio::io_service &io_service_;
+  boost::asio::ip::tcp::endpoint remote_ep_;
   nghttp2_session *session_;
   const uint8_t *buf_;
   std::size_t buflen_;

src/asio_server_http2_impl.cc

@@ -37,12 +37,16 @@ namespace asio_http2 {
 
 namespace server {
 
-http2_impl::http2_impl() : num_threads_(1), backlog_(-1) {}
+http2_impl::http2_impl()
+    : num_threads_(1), backlog_(-1),
+      tls_handshake_timeout_(boost::posix_time::seconds(60)),
+      read_timeout_(boost::posix_time::seconds(60)) {}
 
 boost::system::error_code http2_impl::listen_and_serve(
     boost::system::error_code &ec, boost::asio::ssl::context *tls_context,
     const std::string &address, const std::string &port, bool asynchronous) {
-  server_.reset(new server(num_threads_));
+  server_.reset(
+      new server(num_threads_, tls_handshake_timeout_, read_timeout_));
   return server_->listen_and_serve(ec, tls_context, address, port, backlog_,
                                    mux_, asynchronous);
 }
@@ -51,6 +55,15 @@ void http2_impl::num_threads(size_t num_threads) { num_threads_ = num_threads; }
 
 void http2_impl::backlog(int backlog) { backlog_ = backlog; }
 
+void http2_impl::tls_handshake_timeout(
+    const boost::posix_time::time_duration &t) {
+  tls_handshake_timeout_ = t;
+}
+
+void http2_impl::read_timeout(const boost::posix_time::time_duration &t) {
+  read_timeout_ = t;
+}
+
 bool http2_impl::handle(std::string pattern, request_cb cb) {
   return mux_.handle(std::move(pattern), std::move(cb));
 }
@@ -59,6 +72,11 @@ void http2_impl::stop() { return server_->stop(); }
 
 void http2_impl::join() { return server_->join(); }
 
+const std::vector<std::shared_ptr<boost::asio::io_service>> &
+http2_impl::io_services() const {
+  return server_->io_services();
+}
+
 } // namespace server
 
 } // namespace asio_http2

src/asio_server_http2_impl.h

@@ -47,15 +47,21 @@ public:
       const std::string &address, const std::string &port, bool asynchronous);
   void num_threads(size_t num_threads);
   void backlog(int backlog);
+  void tls_handshake_timeout(const boost::posix_time::time_duration &t);
+  void read_timeout(const boost::posix_time::time_duration &t);
   bool handle(std::string pattern, request_cb cb);
   void stop();
   void join();
+  const std::vector<std::shared_ptr<boost::asio::io_service>> &
+  io_services() const;
 
 private:
   std::unique_ptr<server> server_;
   std::size_t num_threads_;
   int backlog_;
   serve_mux mux_;
+  boost::posix_time::time_duration tls_handshake_timeout_;
+  boost::posix_time::time_duration read_timeout_;
 };
 
 } // namespace server

src/asio_server_request.cc

@@ -50,6 +50,10 @@ void request::on_data(data_cb cb) const {
 
 request_impl &request::impl() const { return *impl_; }
 
+const boost::asio::ip::tcp::endpoint &request::remote_endpoint() const {
+  return impl_->remote_endpoint();
+}
+
 } // namespace server
 } // namespace asio_http2
 } // namespace nghttp2

src/asio_server_request_impl.cc

@@ -54,6 +54,14 @@ void request_impl::call_on_data(const uint8_t *data, std::size_t len) {
   }
 }
 
+const boost::asio::ip::tcp::endpoint &request_impl::remote_endpoint() const {
+  return remote_ep_;
+}
+
+void request_impl::remote_endpoint(boost::asio::ip::tcp::endpoint ep) {
+  remote_ep_ = std::move(ep);
+}
+
 } // namespace server
 } // namespace asio_http2
 } // namespace nghttp2

src/asio_server_request_impl.h

@@ -28,6 +28,7 @@
 #include "nghttp2_config.h"
 
 #include <nghttp2/asio_http2_server.h>
+#include <boost/asio/ip/tcp.hpp>
 
 namespace nghttp2 {
 namespace asio_http2 {
@@ -54,12 +55,16 @@ public:
   void stream(class stream *s);
   void call_on_data(const uint8_t *data, std::size_t len);
 
+  const boost::asio::ip::tcp::endpoint &remote_endpoint() const;
+  void remote_endpoint(boost::asio::ip::tcp::endpoint ep);
+
 private:
   class stream *strm_;
   header_map header_;
   std::string method_;
   uri_ref uri_;
   data_cb on_data_cb_;
+  boost::asio::ip::tcp::endpoint remote_ep_;
 };
 
 } // namespace server

src/h2load.cc

@@ -44,6 +44,7 @@
 #include <chrono>
 #include <thread>
 #include <future>
+#include <random>
 
 #ifdef HAVE_SPDYLAY
 #include <spdylay/spdylay.h>
@@ -96,15 +97,53 @@ bool Config::is_rate_mode() const { return (this->rate != 0); }
 bool Config::has_base_uri() const { return (!this->base_uri.empty()); }
 Config config;
 
-RequestStat::RequestStat() : data_offset(0), completed(false) {}
+namespace {
+constexpr size_t MAX_SAMPLES = 1000000;
+} // namespace
 
 Stats::Stats(size_t req_todo, size_t nclients)
-    : req_todo(0), req_started(0), req_done(0), req_success(0),
+    : req_todo(req_todo), req_started(0), req_done(0), req_success(0),
       req_status_success(0), req_failed(0), req_error(0), req_timedout(0),
       bytes_total(0), bytes_head(0), bytes_head_decomp(0), bytes_body(0),
-      status(), req_stats(req_todo), client_stats(nclients) {}
+      status() {}
 
-Stream::Stream() : status_success(-1) {}
+Stream::Stream() : req_stat{}, status_success(-1) {}
+
+namespace {
+std::random_device rd;
+} // namespace
+
+namespace {
+std::mt19937 gen(rd());
+} // namespace
+
+namespace {
+void sampling_init(Sampling &smp, size_t total, size_t max_samples) {
+  smp.n = 0;
+
+  if (total <= max_samples) {
+    smp.interval = 0.;
+    smp.point = 0.;
+    return;
+  }
+
+  smp.interval = static_cast<double>(total) / max_samples;
+
+  std::uniform_real_distribution<> dis(0., smp.interval);
+
+  smp.point = dis(gen);
+}
+} // namespace
+
+namespace {
+bool sampling_should_pick(Sampling &smp) {
+  return smp.interval == 0. || smp.n == ceil(smp.point);
+}
+} // namespace
+
+namespace {
+void sampling_advance_point(Sampling &smp) { smp.point += smp.interval; }
+} // namespace
 
 namespace {
 void writecb(struct ev_loop *loop, ev_io *w, int revents) {
@@ -118,12 +157,14 @@ void writecb(struct ev_loop *loop, ev_io *w, int revents) {
     rv = client->connect();
     if (rv != 0) {
       client->fail();
+      delete client;
       return;
     }
     return;
   }
   if (rv != 0) {
     client->fail();
+    delete client;
   }
 }
 } // namespace
@@ -134,6 +175,7 @@ void readcb(struct ev_loop *loop, ev_io *w, int revents) {
   client->restart_timeout();
   if (client->do_read() != 0) {
     client->fail();
+    delete client;
     return;
   }
   writecb(loop, &client->wev, revents);
@@ -155,14 +197,18 @@ void rate_period_timeout_w_cb(struct ev_loop *loop, ev_timer *w, int revents) {
       ++req_todo;
       --worker->nreqs_rem;
     }
-    worker->clients.push_back(
+    auto client =
-        make_unique<Client>(worker->next_client_id++, worker, req_todo));
+        make_unique<Client>(worker->next_client_id++, worker, req_todo);
-    auto &client = worker->clients.back();
+
+    ++worker->nconns_made;
+
     if (client->connect() != 0) {
       std::cerr << "client could not connect to host" << std::endl;
       client->fail();
+    } else {
+      client.release();
     }
-    ++worker->nconns_made;
+    worker->report_rate_progress();
   }
   if (worker->nconns_made >= worker->nclients) {
     ev_timer_stop(worker->loop, w);
@@ -240,7 +286,7 @@ void client_request_timeout_cb(struct ev_loop *loop, ev_timer *w, int revents) {
 } // namespace
 
 Client::Client(uint32_t id, Worker *worker, size_t req_todo)
-    : worker(worker), ssl(nullptr), next_addr(config.addrs),
+    : cstat{}, worker(worker), ssl(nullptr), next_addr(config.addrs),
       current_addr(nullptr), reqidx(0), state(CLIENT_IDLE), req_todo(req_todo),
       req_started(0), req_done(0), id(id), fd(-1),
       new_connection_requested(false) {
@@ -268,6 +314,12 @@ Client::~Client() {
   if (ssl) {
     SSL_free(ssl);
   }
+
+  if (sampling_should_pick(worker->client_smp)) {
+    sampling_advance_point(worker->client_smp);
+    worker->sample_client_stat(&cstat);
+  }
+  ++worker->client_smp.n;
 }
 
 int Client::do_read() { return readfn(*this); }
@@ -420,9 +472,8 @@ void Client::disconnect() {
 }
 
 int Client::submit_request() {
-  auto req_stat = &worker->stats.req_stats[worker->stats.req_started++];
+  ++worker->stats.req_started;
-
+  if (session->submit_request() != 0) {
-  if (session->submit_request(req_stat) != 0) {
     return -1;
   }
 
@@ -475,15 +526,6 @@ void Client::process_request_failure() {
   }
 }
 
-void Client::report_progress() {
-  if (!worker->config->is_rate_mode() && worker->id == 0 &&
-      worker->stats.req_done % worker->progress_interval == 0) {
-    std::cout << "progress: "
-              << worker->stats.req_done * 100 / worker->stats.req_todo
-              << "% done" << std::endl;
-  }
-}
-
 namespace {
 void print_server_tmp_key(SSL *ssl) {
 // libressl does not have SSL_get_server_tmp_key
@@ -607,28 +649,40 @@ void Client::on_status_code(int32_t stream_id, uint16_t status) {
   }
 }
 
-void Client::on_stream_close(int32_t stream_id, bool success,
+void Client::on_stream_close(int32_t stream_id, bool success, bool final) {
-                             RequestStat *req_stat, bool final) {
+  auto req_stat = get_req_stat(stream_id);
+  if (!req_stat) {
+    return;
+  }
+
   req_stat->stream_close_time = std::chrono::steady_clock::now();
   if (success) {
     req_stat->completed = true;
     ++worker->stats.req_success;
-    auto &cstat = worker->stats.client_stats[id];
     ++cstat.req_success;
-  }
+
-  ++worker->stats.req_done;
-  ++req_done;
-  if (success) {
     if (streams[stream_id].status_success == 1) {
       ++worker->stats.req_status_success;
     } else {
       ++worker->stats.req_failed;
     }
+
+    if (sampling_should_pick(worker->request_times_smp)) {
+      sampling_advance_point(worker->request_times_smp);
+      worker->sample_req_stat(req_stat);
+    }
+
+    // Count up in successful cases only
+    ++worker->request_times_smp.n;
   } else {
     ++worker->stats.req_failed;
     ++worker->stats.req_error;
   }
-  report_progress();
+
+  ++worker->stats.req_done;
+  ++req_done;
+
+  worker->report_progress();
   streams.erase(stream_id);
   if (req_done == req_todo) {
     terminate_session();
@@ -645,6 +699,15 @@ void Client::on_stream_close(int32_t stream_id, bool success,
   }
 }
 
+RequestStat *Client::get_req_stat(int32_t stream_id) {
+  auto it = streams.find(stream_id);
+  if (it == std::end(streams)) {
+    return nullptr;
+  }
+
+  return &(*it).second.req_stat;
+}
+
 int Client::connection_made() {
   if (ssl) {
     report_tls_info();
@@ -750,7 +813,6 @@ int Client::connection_made() {
   if (!config.timing_script) {
     auto nreq =
         std::min(req_todo - req_started, (size_t)config.max_concurrent_streams);
-
     for (; nreq > 0; --nreq) {
       if (submit_request() != 0) {
         process_request_failure();
@@ -985,17 +1047,14 @@ void Client::record_request_time(RequestStat *req_stat) {
 }
 
 void Client::record_connect_start_time() {
-  auto &cstat = worker->stats.client_stats[id];
   cstat.connect_start_time = std::chrono::steady_clock::now();
 }
 
 void Client::record_connect_time() {
-  auto &cstat = worker->stats.client_stats[id];
   cstat.connect_time = std::chrono::steady_clock::now();
 }
 
 void Client::record_ttfb() {
-  auto &cstat = worker->stats.client_stats[id];
   if (recorded(cstat.ttfb)) {
     return;
   }
@@ -1004,16 +1063,12 @@ void Client::record_ttfb() {
 }
 
 void Client::clear_connect_times() {
-  auto &cstat = worker->stats.client_stats[id];
-
   cstat.connect_start_time = std::chrono::steady_clock::time_point();
   cstat.connect_time = std::chrono::steady_clock::time_point();
   cstat.ttfb = std::chrono::steady_clock::time_point();
 }
 
 void Client::record_client_start_time() {
-  auto &cstat = worker->stats.client_stats[id];
-
   // Record start time only once at the very first connection is going
   // to be made.
   if (recorded(cstat.client_start_time)) {
@@ -1024,8 +1079,6 @@ void Client::record_client_start_time() {
 }
 
 void Client::record_client_end_time() {
-  auto &cstat = worker->stats.client_stats[id];
-
   // Unlike client_start_time, we overwrite client_end_time.  This
   // handles multiple connect/disconnect for HTTP/1.1 benchmark.
   cstat.client_end_time = std::chrono::steady_clock::now();
@@ -1036,20 +1089,36 @@ void Client::signal_write() { ev_io_start(worker->loop, &wev); }
 void Client::try_new_connection() { new_connection_requested = true; }
 
 Worker::Worker(uint32_t id, SSL_CTX *ssl_ctx, size_t req_todo, size_t nclients,
-               size_t rate, Config *config)
+               size_t rate, size_t max_samples, Config *config)
     : stats(req_todo, nclients), loop(ev_loop_new(0)), ssl_ctx(ssl_ctx),
       config(config), id(id), tls_info_report_done(false),
       app_info_report_done(false), nconns_made(0), nclients(nclients),
       nreqs_per_client(req_todo / nclients), nreqs_rem(req_todo % nclients),
-      rate(rate), next_client_id(0) {
+      rate(rate), max_samples(max_samples), next_client_id(0) {
-  stats.req_todo = req_todo;
+  if (!config->is_rate_mode()) {
     progress_interval = std::max(static_cast<size_t>(1), req_todo / 10);
+  } else {
+    progress_interval = std::max(static_cast<size_t>(1), nclients / 10);
+  }
 
   // create timer that will go off every rate_period
   ev_timer_init(&timeout_watcher, rate_period_timeout_w_cb, 0.,
                 config->rate_period);
   timeout_watcher.data = this;
 
+  stats.req_stats.reserve(std::min(req_todo, max_samples));
+  stats.client_stats.reserve(std::min(nclients, max_samples));
+
+  sampling_init(request_times_smp, req_todo, max_samples);
+  sampling_init(client_smp, nclients, max_samples);
+}
+
+Worker::~Worker() {
+  ev_timer_stop(loop, &timeout_watcher);
+  ev_loop_destroy(loop);
+}
+
+void Worker::run() {
   if (!config->is_rate_mode()) {
     for (size_t i = 0; i < nclients; ++i) {
       auto req_todo = nreqs_per_client;
@@ -1057,26 +1126,12 @@ Worker::Worker(uint32_t id, SSL_CTX *ssl_ctx, size_t req_todo, size_t nclients,
         ++req_todo;
         --nreqs_rem;
       }
-      clients.push_back(make_unique<Client>(next_client_id++, this, req_todo));
+      auto client = make_unique<Client>(next_client_id++, this, req_todo);
-    }
-  }
-}
-
-Worker::~Worker() {
-  ev_timer_stop(loop, &timeout_watcher);
-
-  // first clear clients so that io watchers are stopped before
-  // destructing ev_loop.
-  clients.clear();
-  ev_loop_destroy(loop);
-}
-
-void Worker::run() {
-  if (!config->is_rate_mode()) {
-    for (auto &client : clients) {
       if (client->connect() != 0) {
         std::cerr << "client could not connect to host" << std::endl;
         client->fail();
+      } else {
+        client.release();
       }
     }
   } else {
@@ -1088,6 +1143,34 @@ void Worker::run() {
   ev_run(loop, 0);
 }
 
+void Worker::sample_req_stat(RequestStat *req_stat) {
+  stats.req_stats.push_back(*req_stat);
+  assert(stats.req_stats.size() <= max_samples);
+}
+
+void Worker::sample_client_stat(ClientStat *cstat) {
+  stats.client_stats.push_back(*cstat);
+  assert(stats.client_stats.size() <= max_samples);
+}
+
+void Worker::report_progress() {
+  if (id != 0 || config->is_rate_mode() || stats.req_done % progress_interval) {
+    return;
+  }
+
+  std::cout << "progress: " << stats.req_done * 100 / stats.req_todo << "% done"
+            << std::endl;
+}
+
+void Worker::report_rate_progress() {
+  if (id != 0 || nconns_made % progress_interval) {
+    return;
+  }
+
+  std::cout << "progress: " << nconns_made * 100 / nclients
+            << "% of clients started" << std::endl;
+}
+
 namespace {
 // Returns percentage of number of samples within mean +/- sd.
 double within_sd(const std::vector<double> &samples, double mean, double sd) {
@@ -1106,12 +1189,15 @@ double within_sd(const std::vector<double> &samples, double mean, double sd) {
 namespace {
 // Computes statistics using |samples|. The min, max, mean, sd, and
 // percentage of number of samples within mean +/- sd are computed.
-SDStat compute_time_stat(const std::vector<double> &samples) {
+// If |sampling| is true, this computes sample variance.  Otherwise,
+// population variance.
+SDStat compute_time_stat(const std::vector<double> &samples,
+                         bool sampling = false) {
   if (samples.empty()) {
     return {0.0, 0.0, 0.0, 0.0, 0.0};
   }
   // standard deviation calculated using Rapid calculation method:
-  // http://en.wikipedia.org/wiki/Standard_deviation#Rapid_calculation_methods
+  // https://en.wikipedia.org/wiki/Standard_deviation#Rapid_calculation_methods
   double a = 0, q = 0;
   size_t n = 0;
   double sum = 0;
@@ -1130,7 +1216,7 @@ SDStat compute_time_stat(const std::vector<double> &samples) {
 
   assert(n > 0);
   res.mean = sum / n;
-  res.sd = sqrt(q / n);
+  res.sd = sqrt(q / (sampling && n > 1 ? n - 1 : n));
   res.within_sd = within_sd(samples, res.mean, res.sd);
 
   return res;
@@ -1140,18 +1226,29 @@ SDStat compute_time_stat(const std::vector<double> &samples) {
 namespace {
 SDStats
 process_time_stats(const std::vector<std::unique_ptr<Worker>> &workers) {
+  auto request_times_sampling = false;
+  auto client_times_sampling = false;
   size_t nrequest_times = 0;
+  size_t nclient_times = 0;
   for (const auto &w : workers) {
     nrequest_times += w->stats.req_stats.size();
+    if (w->request_times_smp.interval != 0.) {
+      request_times_sampling = true;
+    }
+
+    nclient_times += w->stats.client_stats.size();
+    if (w->client_smp.interval != 0.) {
+      client_times_sampling = true;
+    }
   }
 
   std::vector<double> request_times;
   request_times.reserve(nrequest_times);
 
   std::vector<double> connect_times, ttfb_times, rps_values;
-  connect_times.reserve(config.nclients);
+  connect_times.reserve(nclient_times);
-  ttfb_times.reserve(config.nclients);
+  ttfb_times.reserve(nclient_times);
-  rps_values.reserve(config.nclients);
+  rps_values.reserve(nclient_times);
 
   for (const auto &w : workers) {
     for (const auto &req_stat : w->stats.req_stats) {
@@ -1195,8 +1292,10 @@ process_time_stats(const std::vector<std::unique_ptr<Worker>> &workers) {
     }
   }
 
-  return {compute_time_stat(request_times), compute_time_stat(connect_times),
+  return {compute_time_stat(request_times, request_times_sampling),
-          compute_time_stat(ttfb_times), compute_time_stat(rps_values)};
+          compute_time_stat(connect_times, client_times_sampling),
+          compute_time_stat(ttfb_times, client_times_sampling),
+          compute_time_stat(rps_values, client_times_sampling)};
 }
 } // namespace
 
@@ -1374,7 +1473,7 @@ void read_script_from_file(std::istream &infile,
 namespace {
 std::unique_ptr<Worker> create_worker(uint32_t id, SSL_CTX *ssl_ctx,
                                       size_t nreqs, size_t nclients,
-                                      size_t rate) {
+                                      size_t rate, size_t max_samples) {
   std::stringstream rate_report;
   if (config.is_rate_mode() && nclients > rate) {
     rate_report << "Up to " << rate << " client(s) will be created every "
@@ -1385,7 +1484,8 @@ std::unique_ptr<Worker> create_worker(uint32_t id, SSL_CTX *ssl_ctx,
             << " total client(s). " << rate_report.str() << nreqs
             << " total requests" << std::endl;
 
-  return make_unique<Worker>(id, ssl_ctx, nreqs, nclients, rate, &config);
+  return make_unique<Worker>(id, ssl_ctx, nreqs, nclients, rate, max_samples,
+                             &config);
 }
 } // namespace
 
@@ -1448,10 +1548,11 @@ Options:
               URIs, if present,  are ignored.  Those in  the first URI
               are used solely.  Definition of a base URI overrides all
               scheme, host or port values.
-  -m, --max-concurrent-streams=(auto|<N>)
+  -m, --max-concurrent-streams=<N>
-              Max concurrent streams to  issue per session.  If "auto"
+              Max  concurrent  streams  to issue  per  session.   When
-              is given, the number of given URIs is used.
+              http/1.1  is used,  this  specifies the  number of  HTTP
-              Default: auto
+              pipelining requests in-flight.
+              Default: 1
   -w, --window-bits=<N>
               Sets the stream level initial window size to (2**<N>)-1.
               For SPDY, 2**<N> is used instead.
@@ -1626,11 +1727,7 @@ int main(int argc, char **argv) {
 #endif // NOTHREADS
       break;
     case 'm':
-      if (util::strieq("auto", optarg)) {
-        config.max_concurrent_streams = -1;
-      } else {
       config.max_concurrent_streams = strtoul(optarg, nullptr, 10);
-      }
       break;
     case 'w':
     case 'W': {
@@ -1853,11 +1950,6 @@ int main(int argc, char **argv) {
     exit(EXIT_FAILURE);
   }
 
-  if (config.max_concurrent_streams == -1) {
-    config.max_concurrent_streams = reqlines.size();
-  }
-
-  assert(config.max_concurrent_streams > 0);
   if (config.nreqs == 0) {
     std::cerr << "-n: the number of requests must be strictly greater than 0."
               << std::endl;
@@ -2099,6 +2191,9 @@ int main(int argc, char **argv) {
   size_t rate_per_thread = config.rate / config.nthreads;
   ssize_t rate_per_thread_rem = config.rate % config.nthreads;
 
+  size_t max_samples_per_thread =
+      std::max(static_cast<size_t>(256), MAX_SAMPLES / config.nthreads);
+
   std::mutex mu;
   std::condition_variable cv;
   auto ready = false;
@@ -2131,7 +2226,8 @@ int main(int argc, char **argv) {
       }
     }
 
-    workers.push_back(create_worker(i, ssl_ctx, nreqs, nclients, rate));
+    workers.push_back(create_worker(i, ssl_ctx, nreqs, nclients, rate,
+                                    max_samples_per_thread));
     auto &worker = workers.back();
     futures.push_back(
         std::async(std::launch::async, [&worker, &mu, &cv, &ready]() {
@@ -2161,7 +2257,8 @@ int main(int argc, char **argv) {
   auto nreqs =
       config.timing_script ? config.nreqs * config.nclients : config.nreqs;
 
-  workers.push_back(create_worker(0, ssl_ctx, nreqs, nclients, rate));
+  workers.push_back(
+      create_worker(0, ssl_ctx, nreqs, nclients, rate, MAX_SAMPLES));
 
   auto start = std::chrono::steady_clock::now();
 
@@ -2253,7 +2350,7 @@ time for request: )" << std::setw(10) << util::format_duration(ts.request.min)
             << util::format_duration(ts.ttfb.mean) << "  " << std::setw(10)
             << util::format_duration(ts.ttfb.sd) << std::setw(9)
             << util::dtos(ts.ttfb.within_sd) << "%"
-            << "\nreq/s (client)  : " << std::setw(10) << ts.rps.min << "  "
+            << "\nreq/s           : " << std::setw(10) << ts.rps.min << "  "
             << std::setw(10) << ts.rps.max << "  " << std::setw(10)
             << ts.rps.mean << "  " << std::setw(10) << ts.rps.sd << std::setw(9)
             << util::dtos(ts.rps.within_sd) << "%" << std::endl;

src/h2load.h

@@ -112,7 +112,6 @@ struct Config {
 };
 
 struct RequestStat {
-  RequestStat();
   // time point when request was sent
   std::chrono::steady_clock::time_point request_time;
   // time point when stream was closed
@@ -208,9 +207,21 @@ enum ClientState { CLIENT_IDLE, CLIENT_CONNECTED };
 
 struct Client;
 
+// We use systematic sampling method
+struct Sampling {
+  // sampling interval
+  double interval;
+  // cumulative value of interval, and the next point is the integer
+  // rounded up from this value.
+  double point;
+  // number of samples seen, including discarded samples.
+  size_t n;
+};
+
 struct Worker {
-  std::vector<std::unique_ptr<Client>> clients;
   Stats stats;
+  Sampling request_times_smp;
+  Sampling client_smp;
   struct ev_loop *loop;
   SSL_CTX *ssl_ctx;
   Config *config;
@@ -226,24 +237,32 @@ struct Worker {
   // at most nreqs_rem clients get an extra request
   size_t nreqs_rem;
   size_t rate;
+  // maximum number of samples in this worker thread
+  size_t max_samples;
   ev_timer timeout_watcher;
   // The next client ID this worker assigns
   uint32_t next_client_id;
 
   Worker(uint32_t id, SSL_CTX *ssl_ctx, size_t nreq_todo, size_t nclients,
-         size_t rate, Config *config);
+         size_t rate, size_t max_samples, Config *config);
   ~Worker();
   Worker(Worker &&o) = default;
   void run();
+  void sample_req_stat(RequestStat *req_stat);
+  void sample_client_stat(ClientStat *cstat);
+  void report_progress();
+  void report_rate_progress();
 };
 
 struct Stream {
+  RequestStat req_stat;
   int status_success;
   Stream();
 };
 
 struct Client {
   std::unordered_map<int32_t, Stream> streams;
+  ClientStat cstat;
   std::unique_ptr<Session> session;
   ev_io wev;
   ev_io rev;
@@ -288,7 +307,6 @@ struct Client {
   void process_request_failure();
   void process_timedout_streams();
   void process_abandoned_streams();
-  void report_progress();
   void report_tls_info();
   void report_app_info();
   void terminate_session();
@@ -318,8 +336,12 @@ struct Client {
   // |success| == true means that the request/response was exchanged
   // |successfully, but it does not mean response carried successful
   // |HTTP status code.
-  void on_stream_close(int32_t stream_id, bool success, RequestStat *req_stat,
+  void on_stream_close(int32_t stream_id, bool success, bool final = false);
-                       bool final = false);
+  // Returns RequestStat for |stream_id|.  This function must be
+  // called after on_request(stream_id), and before
+  // on_stream_close(stream_id, ...).  Otherwise, this will return
+  // nullptr.
+  RequestStat *get_req_stat(int32_t stream_id);
 
   void record_request_time(RequestStat *req_stat);
   void record_connect_start_time();

src/h2load_http1_session.cc

@@ -80,9 +80,11 @@ int htp_msg_completecb(http_parser *htp) {
   auto client = session->get_client();
 
   auto final = http_should_keep_alive(htp) == 0;
-  client->on_stream_close(session->stream_resp_counter_, true,
+  auto req_stat = client->get_req_stat(session->stream_resp_counter_);
-                          session->req_stats_[session->stream_resp_counter_],
+
-                          final);
+  assert(req_stat);
+
+  client->on_stream_close(session->stream_resp_counter_, true, final);
 
   session->stream_resp_counter_ += 2;
 
@@ -150,7 +152,7 @@ http_parser_settings htp_hooks = {
 
 void Http1Session::on_connect() { client_->signal_write(); }
 
-int Http1Session::submit_request(RequestStat *req_stat) {
+int Http1Session::submit_request() {
   auto config = client_->worker->config;
   const auto &req = config->h1reqs[client_->reqidx];
   client_->reqidx++;
@@ -159,13 +161,13 @@ int Http1Session::submit_request(RequestStat *req_stat) {
     client_->reqidx = 0;
   }
 
-  assert(req_stat);
+  client_->on_request(stream_req_counter_);
+
+  auto req_stat = client_->get_req_stat(stream_req_counter_);
+
   client_->record_request_time(req_stat);
   client_->wb.write(req.c_str(), req.size());
 
-  client_->on_request(stream_req_counter_);
-  req_stats_[stream_req_counter_] = req_stat;
-
   // increment for next request
   stream_req_counter_ += 2;
 

src/h2load_http1_session.h

@@ -38,14 +38,13 @@ public:
   Http1Session(Client *client);
   virtual ~Http1Session();
   virtual void on_connect();
-  virtual int submit_request(RequestStat *req_stat);
+  virtual int submit_request();
   virtual int on_read(const uint8_t *data, size_t len);
   virtual int on_write();
   virtual void terminate();
   Client *get_client();
   int32_t stream_req_counter_;
   int32_t stream_resp_counter_;
-  std::unordered_map<int32_t, RequestStat *> req_stats_;
 
 private:
   Client *client_;

src/h2load_http2_session.cc

@@ -89,12 +89,25 @@ namespace {
 int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
                              uint32_t error_code, void *user_data) {
   auto client = static_cast<Client *>(user_data);
-  auto req_stat = static_cast<RequestStat *>(
+  client->on_stream_close(stream_id, error_code == NGHTTP2_NO_ERROR);
-      nghttp2_session_get_stream_user_data(session, stream_id));
+
-  if (!req_stat) {
   return 0;
 }
-  client->on_stream_close(stream_id, error_code == NGHTTP2_NO_ERROR, req_stat);
+} // namespace
+
+namespace {
+int on_frame_not_send_callback(nghttp2_session *session,
+                               const nghttp2_frame *frame, int lib_error_code,
+                               void *user_data) {
+  if (frame->hd.type != NGHTTP2_HEADERS ||
+      frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
+    return 0;
+  }
+
+  auto client = static_cast<Client *>(user_data);
+  // request was not sent.  Mark it as error.
+  client->on_stream_close(frame->hd.stream_id, false);
+
   return 0;
 }
 } // namespace
@@ -108,9 +121,7 @@ int before_frame_send_callback(nghttp2_session *session,
   }
 
   auto client = static_cast<Client *>(user_data);
-  client->on_request(frame->hd.stream_id);
+  auto req_stat = client->get_req_stat(frame->hd.stream_id);
-  auto req_stat = static_cast<RequestStat *>(
-      nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
   assert(req_stat);
   client->record_request_time(req_stat);
 
@@ -124,8 +135,7 @@ ssize_t file_read_callback(nghttp2_session *session, int32_t stream_id,
                            nghttp2_data_source *source, void *user_data) {
   auto client = static_cast<Client *>(user_data);
   auto config = client->worker->config;
-  auto req_stat = static_cast<RequestStat *>(
+  auto req_stat = client->get_req_stat(stream_id);
-      nghttp2_session_get_stream_user_data(session, stream_id));
   assert(req_stat);
   ssize_t nread;
   while ((nread = pread(config->data_fd, buf, length, req_stat->data_offset)) ==
@@ -183,6 +193,9 @@ void Http2Session::on_connect() {
   nghttp2_session_callbacks_set_on_header_callback(callbacks,
                                                    on_header_callback);
 
+  nghttp2_session_callbacks_set_on_frame_not_send_callback(
+      callbacks, on_frame_not_send_callback);
+
   nghttp2_session_callbacks_set_before_frame_send_callback(
       callbacks, before_frame_send_callback);
 
@@ -212,7 +225,7 @@ void Http2Session::on_connect() {
   client_->signal_write();
 }
 
-int Http2Session::submit_request(RequestStat *req_stat) {
+int Http2Session::submit_request() {
   if (nghttp2_session_check_request_allowed(session_) == 0) {
     return -1;
   }
@@ -228,11 +241,13 @@ int Http2Session::submit_request(RequestStat *req_stat) {
 
   auto stream_id =
       nghttp2_submit_request(session_, nullptr, nva.data(), nva.size(),
-                             config->data_fd == -1 ? nullptr : &prd, req_stat);
+                             config->data_fd == -1 ? nullptr : &prd, nullptr);
   if (stream_id < 0) {
     return -1;
   }
 
+  client_->on_request(stream_id);
+
   return 0;
 }
 

src/h2load_http2_session.h

@@ -38,7 +38,7 @@ public:
   Http2Session(Client *client);
   virtual ~Http2Session();
   virtual void on_connect();
-  virtual int submit_request(RequestStat *req_stat);
+  virtual int submit_request();
   virtual int on_read(const uint8_t *data, size_t len);
   virtual int on_write();
   virtual void terminate();

src/h2load_session.h

@@ -41,7 +41,7 @@ public:
   // Called when the connection was made.
   virtual void on_connect() = 0;
   // Called when one request must be issued.
-  virtual int submit_request(RequestStat *req_stat) = 0;
+  virtual int submit_request() = 0;
   // Called when incoming bytes are available. The subclass has to
   // return the number of bytes read.
   virtual int on_read(const uint8_t *data, size_t len) = 0;

src/h2load_spdy_session.cc

@@ -48,9 +48,7 @@ void before_ctrl_send_callback(spdylay_session *session,
     return;
   }
   client->on_request(frame->syn_stream.stream_id);
-  auto req_stat =
+  auto req_stat = client->get_req_stat(frame->syn_stream.stream_id);
-      static_cast<RequestStat *>(spdylay_session_get_stream_user_data(
-          session, frame->syn_stream.stream_id));
   client->record_request_time(req_stat);
 }
 } // namespace
@@ -104,9 +102,7 @@ void on_stream_close_callback(spdylay_session *session, int32_t stream_id,
                               spdylay_status_code status_code,
                               void *user_data) {
   auto client = static_cast<Client *>(user_data);
-  auto req_stat = static_cast<RequestStat *>(
+  client->on_stream_close(stream_id, status_code == SPDYLAY_OK);
-      spdylay_session_get_stream_user_data(session, stream_id));
-  client->on_stream_close(stream_id, status_code == SPDYLAY_OK, req_stat);
 }
 } // namespace
 
@@ -130,8 +126,7 @@ ssize_t file_read_callback(spdylay_session *session, int32_t stream_id,
                            spdylay_data_source *source, void *user_data) {
   auto client = static_cast<Client *>(user_data);
   auto config = client->worker->config;
-  auto req_stat = static_cast<RequestStat *>(
+  auto req_stat = client->get_req_stat(stream_id);
-      spdylay_session_get_stream_user_data(session, stream_id));
 
   ssize_t nread;
   while ((nread = pread(config->data_fd, buf, length, req_stat->data_offset)) ==
@@ -185,7 +180,7 @@ void SpdySession::on_connect() {
   client_->signal_write();
 }
 
-int SpdySession::submit_request(RequestStat *req_stat) {
+int SpdySession::submit_request() {
   int rv;
   auto config = client_->worker->config;
   auto &nv = config->nv[client_->reqidx++];
@@ -197,7 +192,7 @@ int SpdySession::submit_request(RequestStat *req_stat) {
   spdylay_data_provider prd{{0}, file_read_callback};
 
   rv = spdylay_submit_request(session_, 0, nv.data(),
-                              config->data_fd == -1 ? nullptr : &prd, req_stat);
+                              config->data_fd == -1 ? nullptr : &prd, nullptr);
 
   if (rv != 0) {
     return -1;

src/h2load_spdy_session.h

@@ -40,7 +40,7 @@ public:
   SpdySession(Client *client, uint16_t spdy_version);
   virtual ~SpdySession();
   virtual void on_connect();
-  virtual int submit_request(RequestStat *req_stat);
+  virtual int submit_request();
   virtual int on_read(const uint8_t *data, size_t len);
   virtual int on_write();
   virtual void terminate();

src/http2.cc

@@ -113,6 +113,8 @@ std::string get_status_string(unsigned int status_code) {
     return "429 Too Many Requests";
   case 431:
     return "431 Request Header Fields Too Large";
+  case 451:
+    return "451 Unavailable For Legal Reasons";
   case 500:
     return "500 Internal Server Error";
   case 501:
@@ -215,6 +217,8 @@ const char *stringify_status(unsigned int status_code) {
     return "429";
   case 431:
     return "431";
+  case 451:
+    return "451";
   case 500:
     return "500";
   case 501:

src/includes/nghttp2/asio_http2_client.h

@@ -144,6 +144,12 @@ public:
   // and session is terminated.
   void on_error(error_cb cb) const;
 
+  // Sets connect timeout, which defaults to 60 seconds.
+  void connect_timeout(const boost::posix_time::time_duration &t);
+
+  // Sets read timeout, which defaults to 60 seconds.
+  void read_timeout(const boost::posix_time::time_duration &t);
+
   // Shutdowns connection.
   void shutdown() const;
 
@@ -177,7 +183,7 @@ public:
                         generator_cb cb, header_map h = header_map{}) const;
 
 private:
-  std::unique_ptr<session_impl> impl_;
+  std::shared_ptr<session_impl> impl_;
 };
 
 // configure |tls_ctx| for client use.  Currently, we just set NPN

src/includes/nghttp2/asio_http2_server.h

@@ -59,6 +59,9 @@ public:
   // Application must not call this directly.
   request_impl &impl() const;
 
+  // Returns the remote endpoint of the request
+  const boost::asio::ip::tcp::endpoint &remote_endpoint() const;
+
 private:
   std::unique_ptr<request_impl> impl_;
 };
@@ -195,12 +198,22 @@ public:
   // connections.
   void backlog(int backlog);
 
+  // Sets TLS handshake timeout, which defaults to 60 seconds.
+  void tls_handshake_timeout(const boost::posix_time::time_duration &t);
+
+  // Sets read timeout, which defaults to 60 seconds.
+  void read_timeout(const boost::posix_time::time_duration &t);
+
   // Gracefully stop http2 server
   void stop();
 
   // Join on http2 server and wait for it to fully stop
   void join();
 
+  // Get access to the io_service objects.
+  const std::vector<std::shared_ptr<boost::asio::io_service>> &
+  io_services() const;
+
 private:
   std::unique_ptr<http2_impl> impl_;
 };

src/nghttpd.cc

@@ -164,6 +164,8 @@ Options:
               Path  to file  that contains  MIME media  types and  the
               extensions that represent them.
               Default: )" << config.mime_types_file << R"(
+  --no-content-length
+              Don't send content-length header field.
   --version   Display version information and exit.
   -h, --help  Display this help and exit.
 
@@ -209,6 +211,7 @@ int main(int argc, char **argv) {
         {"hexdump", no_argument, &flag, 7},
         {"echo-upload", no_argument, &flag, 8},
         {"mime-types-file", required_argument, &flag, 9},
+        {"no-content-length", no_argument, &flag, 10},
         {nullptr, 0, nullptr, 0}};
     int option_index = 0;
     int c = getopt_long(argc, argv, "DVb:c:d:ehm:n:p:va:", long_options,
@@ -340,6 +343,10 @@ int main(int argc, char **argv) {
         mime_types_file_set_manually = true;
         config.mime_types_file = optarg;
         break;
+      case 10:
+        // no-content-length option
+        config.no_content_length = true;
+        break;
       }
       break;
     default:

src/shrpx.cc

@@ -1610,14 +1610,15 @@ HTTP:
               used several  times to  specify multiple  header fields.
               Example: --add-response-header="foo: bar"
   --header-field-buffer=<SIZE>
-              Set maximum  buffer size for incoming  HTTP header field
+              Set maximum buffer size for incoming HTTP request header
-              list.   This is  the sum  of  header name  and value  in
+              field list.  This is the sum of header name and value in
               bytes.
               Default: )"
       << util::utos_with_unit(get_config()->header_field_buffer) << R"(
   --max-header-fields=<N>
-              Set maximum number of incoming HTTP header fields, which
+              Set  maximum  number  of incoming  HTTP  request  header
-              appear in one request or response header field list.
+              fields, which  appear in one request  or response header
+              field list.
               Default: )" << get_config()->max_header_fields << R"(
 
 Debug:

src/shrpx.h

@@ -44,4 +44,8 @@
 
 #define DIE() _Exit(EXIT_FAILURE)
 
+#if defined(HAVE_DECL_INITGROUPS) && !HAVE_DECL_INITGROUPS
+inline int initgroups(const char *user, gid_t group) { return 0; }
+#endif // defined(HAVE_DECL_INITGROUPS) && !HAVE_DECL_INITGROUPS
+
 #endif // SHRPX_H

src/shrpx_client_handler.cc

@@ -718,6 +718,34 @@ void ClientHandler::direct_http2_upgrade() {
 
 int ClientHandler::perform_http2_upgrade(HttpsUpstream *http) {
   auto upstream = make_unique<Http2Upstream>(this);
+
+  auto output = upstream->get_response_buf();
+
+  // We might have written non-final header in response_buf, in this
+  // case, response_state is still INITIAL.  If this non-final header
+  // and upgrade header fit in output buffer, do upgrade.  Otherwise,
+  // to avoid to send this non-final header as response body in HTTP/2
+  // upstream, fail upgrade.
+  auto downstream = http->get_downstream();
+  auto input = downstream->get_response_buf();
+
+  static constexpr char res[] =
+      "HTTP/1.1 101 Switching Protocols\r\n"
+      "Connection: Upgrade\r\n"
+      "Upgrade: " NGHTTP2_CLEARTEXT_PROTO_VERSION_ID "\r\n"
+      "\r\n";
+
+  auto required_size = str_size(res) + input->rleft();
+
+  if (output->wleft() < required_size) {
+    if (LOG_ENABLED(INFO)) {
+      CLOG(INFO, this)
+          << "HTTP Upgrade failed because of insufficient buffer space: need "
+          << required_size << ", available " << output->wleft();
+    }
+    return -1;
+  }
+
   if (upstream->upgrade_upstream(http) != 0) {
     return -1;
   }
@@ -729,11 +757,11 @@ int ClientHandler::perform_http2_upgrade(HttpsUpstream *http) {
   on_read_ = &ClientHandler::upstream_http2_connhd_read;
   write_ = &ClientHandler::write_clear;
 
-  static char res[] = "HTTP/1.1 101 Switching Protocols\r\n"
+  auto nread =
-                      "Connection: Upgrade\r\n"
+      downstream->get_response_buf()->remove(output->last, output->wleft());
-                      "Upgrade: " NGHTTP2_CLEARTEXT_PROTO_VERSION_ID "\r\n"
+  output->write(nread);
-                      "\r\n";
+
-  upstream->get_response_buf()->write(res, sizeof(res) - 1);
+  output->write(res, str_size(res));
   upstream_ = std::move(upstream);
 
   signal_write();

src/shrpx_config.cc

@@ -276,11 +276,9 @@ std::string read_passwd_from_file(const char *filename) {
 }
 
 std::pair<std::string, std::string> parse_header(const char *optarg) {
-  // We skip possible ":" at the start of optarg.
+  const auto *colon = strchr(optarg, ':');
-  const auto *colon = strchr(optarg + 1, ':');
 
-  // name = ":" is not allowed
+  if (colon == nullptr || colon == optarg) {
-  if (colon == nullptr || (optarg[0] == ':' && colon == optarg + 1)) {
     return {"", ""};
   }
 
@@ -291,7 +289,14 @@ std::pair<std::string, std::string> parse_header(const char *optarg) {
   auto p = std::make_pair(std::string(optarg, colon),
                           std::string(value, strlen(value)));
   util::inp_strlower(p.first);
-  util::inp_strlower(p.second);
+
+  if (!nghttp2_check_header_name(
+          reinterpret_cast<const uint8_t *>(p.first.c_str()), p.first.size()) ||
+      !nghttp2_check_header_value(
+          reinterpret_cast<const uint8_t *>(p.second.c_str()),
+          p.second.size())) {
+    return {"", ""};
+  }
 
   return p;
 }
@@ -1800,7 +1805,7 @@ int parse_config(const char *opt, const char *optarg,
   case SHRPX_OPTID_ADD_RESPONSE_HEADER: {
     auto p = parse_header(optarg);
     if (p.first.empty()) {
-      LOG(ERROR) << opt << ": header field name is empty: " << optarg;
+      LOG(ERROR) << opt << ": invalid header field: " << optarg;
       return -1;
     }
     if (optid == SHRPX_OPTID_ADD_REQUEST_HEADER) {

src/shrpx_config_test.cc

@@ -46,8 +46,7 @@ void test_shrpx_config_parse_header(void) {
   CU_ASSERT("b" == p.second);
 
   p = parse_header(":a: b");
-  CU_ASSERT(":a" == p.first);
+  CU_ASSERT(p.first.empty());
-  CU_ASSERT("b" == p.second);
 
   p = parse_header("a: :b");
   CU_ASSERT("a" == p.first);
@@ -59,6 +58,12 @@ void test_shrpx_config_parse_header(void) {
   p = parse_header("alpha: bravo charlie");
   CU_ASSERT("alpha" == p.first);
   CU_ASSERT("bravo charlie" == p.second);
+
+  p = parse_header("a,: b");
+  CU_ASSERT(p.first.empty());
+
+  p = parse_header("a: b\x0a");
+  CU_ASSERT(p.first.empty());
 }
 
 void test_shrpx_config_parse_log_format(void) {

src/shrpx_http2_session.cc

@@ -757,26 +757,6 @@ int on_header_callback(nghttp2_session *session, const nghttp2_frame *frame,
     auto trailer = frame->headers.cat == NGHTTP2_HCAT_HEADERS &&
                    !downstream->get_expect_final_response();
 
-    if (downstream->get_response_headers_sum() + namelen + valuelen >
-            get_config()->header_field_buffer ||
-        downstream->get_response_headers().size() >=
-            get_config()->max_header_fields) {
-      if (LOG_ENABLED(INFO)) {
-        DLOG(INFO, downstream)
-            << "Too large or many header field size="
-            << downstream->get_response_headers_sum() + namelen + valuelen
-            << ", num=" << downstream->get_response_headers().size() + 1;
-      }
-
-      if (trailer) {
-        // we don't care trailer part exceeds header size limit; just
-        // discard it.
-        return 0;
-      }
-
-      return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
-    }
-
     if (trailer) {
       // just store header fields for trailer part
       downstream->add_response_trailer(name, namelen, value, valuelen,
@@ -803,21 +783,6 @@ int on_header_callback(nghttp2_session *session, const nghttp2_frame *frame,
 
     assert(promised_downstream);
 
-    if (promised_downstream->get_request_headers_sum() + namelen + valuelen >
-            get_config()->header_field_buffer ||
-        promised_downstream->get_request_headers().size() >=
-            get_config()->max_header_fields) {
-      if (LOG_ENABLED(INFO)) {
-        DLOG(INFO, promised_downstream)
-            << "Too large or many header field size="
-            << promised_downstream->get_request_headers_sum() + namelen +
-                   valuelen << ", num="
-            << promised_downstream->get_request_headers().size() + 1;
-      }
-
-      return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
-    }
-
     auto token = http2::lookup_token(name, namelen);
     promised_downstream->add_request_header(name, namelen, value, valuelen,
                                             flags & NGHTTP2_NV_FLAG_NO_INDEX,

src/shrpx_http2_upstream.cc

@@ -169,7 +169,8 @@ int on_header_callback(nghttp2_session *session, const nghttp2_frame *frame,
 
   if (downstream->get_request_headers_sum() + namelen + valuelen >
           get_config()->header_field_buffer ||
-      downstream->get_request_headers().size() >=
+      downstream->get_request_headers().size() +
+              downstream->get_request_trailers().size() >=
           get_config()->max_header_fields) {
     if (downstream->get_response_state() == Downstream::MSG_COMPLETE) {
       return 0;

src/shrpx_http_downstream_connection.cc

@@ -562,29 +562,10 @@ int htp_hdrs_completecb(http_parser *htp) {
 namespace {
 int htp_hdr_keycb(http_parser *htp, const char *data, size_t len) {
   auto downstream = static_cast<Downstream *>(htp->data);
-
-  if (downstream->get_response_headers_sum() + len >
-      get_config()->header_field_buffer) {
-    if (LOG_ENABLED(INFO)) {
-      DLOG(INFO, downstream) << "Too large header block size="
-                             << downstream->get_response_headers_sum() + len;
-    }
-    return -1;
-  }
-
   if (downstream->get_response_state() == Downstream::INITIAL) {
     if (downstream->get_response_header_key_prev()) {
       downstream->append_last_response_header_key(data, len);
     } else {
-      if (downstream->get_response_headers().size() >=
-          get_config()->max_header_fields) {
-        if (LOG_ENABLED(INFO)) {
-          DLOG(INFO, downstream)
-              << "Too many header field num="
-              << downstream->get_response_headers().size() + 1;
-        }
-        return -1;
-      }
       downstream->add_response_header(std::string(data, len), "");
     }
   } else {
@@ -592,15 +573,6 @@ int htp_hdr_keycb(http_parser *htp, const char *data, size_t len) {
     if (downstream->get_response_trailer_key_prev()) {
       downstream->append_last_response_trailer_key(data, len);
     } else {
-      if (downstream->get_response_headers().size() >=
-          get_config()->max_header_fields) {
-        if (LOG_ENABLED(INFO)) {
-          DLOG(INFO, downstream)
-              << "Too many header field num="
-              << downstream->get_response_headers().size() + 1;
-        }
-        return -1;
-      }
       downstream->add_response_trailer(std::string(data, len), "");
     }
   }
@@ -611,14 +583,6 @@ int htp_hdr_keycb(http_parser *htp, const char *data, size_t len) {
 namespace {
 int htp_hdr_valcb(http_parser *htp, const char *data, size_t len) {
   auto downstream = static_cast<Downstream *>(htp->data);
-  if (downstream->get_response_headers_sum() + len >
-      get_config()->header_field_buffer) {
-    if (LOG_ENABLED(INFO)) {
-      DLOG(INFO, downstream) << "Too large header block size="
-                             << downstream->get_response_headers_sum() + len;
-    }
-    return -1;
-  }
   if (downstream->get_response_state() == Downstream::INITIAL) {
     if (downstream->get_response_header_key_prev()) {
       downstream->set_last_response_header_value(data, len);

src/shrpx_https_upstream.cc

@@ -146,7 +146,8 @@ int htp_hdr_keycb(http_parser *htp, const char *data, size_t len) {
     if (downstream->get_request_trailer_key_prev()) {
       downstream->append_last_request_trailer_key(data, len);
     } else {
-      if (downstream->get_request_headers().size() >=
+      if (downstream->get_request_headers().size() +
+              downstream->get_request_trailers().size() >=
           get_config()->max_header_fields) {
         if (LOG_ENABLED(INFO)) {
           ULOG(INFO, upstream) << "Too many header field num="
@@ -409,11 +410,6 @@ int htp_msg_completecb(http_parser *htp) {
 
   if (handler->get_http2_upgrade_allowed() &&
       downstream->get_http2_upgrade_request() &&
-      // we may write non-final header in response_buf, in this case,
-      // response_state is still INITIAL.  So don't upgrade in this
-      // case, otherwise we end up send this non-final header as
-      // response body in HTTP/2 upstream.
-      downstream->get_response_buf()->rleft() == 0 &&
       handler->perform_http2_upgrade(upstream) != 0) {
     if (LOG_ENABLED(INFO)) {
       ULOG(INFO, upstream) << "HTTP Upgrade to HTTP/2 failed";

src/shrpx_spdy_upstream.cc

@@ -169,6 +169,8 @@ void on_ctrl_recv_callback(spdylay_session *session, spdylay_frame_type type,
       header_buffer += strlen(nv[i]) + strlen(nv[i + 1]);
     }
 
+    // spdy does not define usage of trailer fields, and we ignores
+    // them.
     if (header_buffer > get_config()->header_field_buffer ||
         num_headers > get_config()->max_header_fields) {
       upstream->rst_stream(downstream, SPDYLAY_INTERNAL_ERROR);

src/shrpx_ssl.cc

@@ -41,6 +41,7 @@
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/rand.h>
+#include <openssl/dh.h>
 
 #include <nghttp2/nghttp2.h>
 

src/ssl.cc

@@ -80,12 +80,7 @@ LibsslGlobalLock::LibsslGlobalLock() {
 LibsslGlobalLock::~LibsslGlobalLock() { ssl_global_locks.clear(); }
 
 const char *get_tls_protocol(SSL *ssl) {
-  auto session = SSL_get_session(ssl);
+  switch (SSL_version(ssl)) {
-  if (!session) {
-    return "unknown";
-  }
-
-  switch (session->ssl_version) {
   case SSL2_VERSION:
     return "SSLv2";
   case SSL3_VERSION:
@@ -113,10 +108,12 @@ TLSSessionInfo *get_tls_session_info(TLSSessionInfo *tls_info, SSL *ssl) {
 
   tls_info->cipher = SSL_get_cipher_name(ssl);
   tls_info->protocol = get_tls_protocol(ssl);
-  tls_info->session_id = session->session_id;
-  tls_info->session_id_length = session->session_id_length;
   tls_info->session_reused = SSL_session_reused(ssl);
 
+  unsigned int session_id_length;
+  tls_info->session_id = SSL_SESSION_get_id(session, &session_id_length);
+  tls_info->session_id_length = session_id_length;
+
   return tls_info;
 }
 

tests/main.c

@@ -89,6 +89,8 @@ int main(int argc _U_, char *argv[] _U_) {
                    test_nghttp2_session_recv_headers_with_priority) ||
       !CU_add_test(pSuite, "session_recv_headers_early_response",
                    test_nghttp2_session_recv_headers_early_response) ||
+      !CU_add_test(pSuite, "session_server_recv_push_response",
+                   test_nghttp2_session_server_recv_push_response) ||
       !CU_add_test(pSuite, "session_recv_premature_headers",
                    test_nghttp2_session_recv_premature_headers) ||
       !CU_add_test(pSuite, "session_recv_unknown_frame",
@@ -128,6 +130,8 @@ int main(int argc _U_, char *argv[] _U_) {
                    test_nghttp2_session_on_window_update_received) ||
       !CU_add_test(pSuite, "session_on_data_received",
                    test_nghttp2_session_on_data_received) ||
+      !CU_add_test(pSuite, "session_on_data_received_fail_fast",
+                   test_nghttp2_session_on_data_received_fail_fast) ||
       !CU_add_test(pSuite, "session_send_headers_start_stream",
                    test_nghttp2_session_send_headers_start_stream) ||
       !CU_add_test(pSuite, "session_send_headers_reply",
@@ -205,8 +209,6 @@ int main(int argc _U_, char *argv[] _U_) {
                    test_nghttp2_session_reply_fail) ||
       !CU_add_test(pSuite, "session_max_concurrent_streams",
                    test_nghttp2_session_max_concurrent_streams) ||
-      !CU_add_test(pSuite, "session_stream_close_on_headers_push",
-                   test_nghttp2_session_stream_close_on_headers_push) ||
       !CU_add_test(pSuite, "session_stop_data_with_rst_stream",
                    test_nghttp2_session_stop_data_with_rst_stream) ||
       !CU_add_test(pSuite, "session_defer_data",
@@ -291,6 +293,10 @@ int main(int argc _U_, char *argv[] _U_) {
       !CU_add_test(pSuite, "session_flooding", test_nghttp2_session_flooding) ||
       !CU_add_test(pSuite, "session_change_stream_priority",
                    test_nghttp2_session_change_stream_priority) ||
+      !CU_add_test(pSuite, "session_repeated_priority_change",
+                   test_nghttp2_session_repeated_priority_change) ||
+      !CU_add_test(pSuite, "session_repeated_priority_submission",
+                   test_nghttp2_session_repeated_priority_submission) ||
       !CU_add_test(pSuite, "http_mandatory_headers",
                    test_nghttp2_http_mandatory_headers) ||
       !CU_add_test(pSuite, "http_content_length",

tests/nghttp2_session_test.c

@@ -342,16 +342,6 @@ static int send_data_callback(nghttp2_session *session _U_,
   return 0;
 }
 
-/* static void no_stream_user_data_stream_close_callback */
-/* (nghttp2_session *session, */
-/*  int32_t stream_id, */
-/*  nghttp2_error_code error_code, */
-/*  void *user_data) */
-/* { */
-/*   my_user_data* my_data = (my_user_data*)user_data; */
-/*   ++my_data->stream_close_cb_called; */
-/* } */
-
 static ssize_t block_count_send_callback(nghttp2_session *session _U_,
                                          const uint8_t *data _U_, size_t len,
                                          int flags _U_, void *user_data) {
@@ -1487,6 +1477,58 @@ void test_nghttp2_session_recv_headers_early_response(void) {
   nghttp2_bufs_free(&bufs);
 }
 
+void test_nghttp2_session_server_recv_push_response(void) {
+  nghttp2_session *session;
+  nghttp2_session_callbacks callbacks;
+  nghttp2_bufs bufs;
+  nghttp2_buf *buf;
+  ssize_t rv;
+  my_user_data ud;
+  nghttp2_mem *mem;
+  nghttp2_frame frame;
+  nghttp2_hd_deflater deflater;
+  nghttp2_nv *nva;
+  size_t nvlen;
+
+  mem = nghttp2_mem_default();
+  frame_pack_bufs_init(&bufs);
+
+  memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
+  callbacks.on_invalid_frame_recv_callback = on_invalid_frame_recv_callback;
+
+  nghttp2_session_server_new(&session, &callbacks, &ud);
+
+  nghttp2_hd_deflate_init(&deflater, mem);
+
+  nghttp2_session_open_stream(session, 2, NGHTTP2_STREAM_FLAG_NONE,
+                              &pri_spec_default, NGHTTP2_STREAM_RESERVED, NULL);
+
+  nvlen = ARRLEN(resnv);
+  nghttp2_nv_array_copy(&nva, resnv, nvlen, mem);
+  nghttp2_frame_headers_init(&frame.headers, NGHTTP2_FLAG_END_HEADERS, 2,
+                             NGHTTP2_HCAT_HEADERS, &pri_spec_default, nva,
+                             nvlen);
+  rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
+
+  CU_ASSERT(0 == rv);
+  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+
+  nghttp2_frame_headers_free(&frame.headers, mem);
+
+  buf = &bufs.head->buf;
+
+  ud.invalid_frame_recv_cb_called = 0;
+
+  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+
+  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  CU_ASSERT(1 == ud.invalid_frame_recv_cb_called);
+
+  nghttp2_bufs_free(&bufs);
+  nghttp2_hd_deflate_free(&deflater);
+  nghttp2_session_del(session);
+}
+
 void test_nghttp2_session_recv_premature_headers(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
@@ -2329,6 +2371,25 @@ void test_nghttp2_session_on_request_headers_received(void) {
   nghttp2_frame_headers_free(&frame.headers, mem);
 
   nghttp2_session_del(session);
+
+  nghttp2_session_server_new(&session, &callbacks, &user_data);
+
+  /* HEADERS to closed stream */
+  stream = open_stream(session, 1);
+  session->last_recv_stream_id = 1;
+  nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
+  nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR);
+
+  nghttp2_frame_headers_init(&frame.headers, NGHTTP2_FLAG_END_HEADERS, 1,
+                             NGHTTP2_HCAT_REQUEST, NULL, NULL, 0);
+
+  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
+            nghttp2_session_on_request_headers_received(session, &frame));
+  CU_ASSERT(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
+
+  nghttp2_frame_headers_free(&frame.headers, mem);
+
+  nghttp2_session_del(session);
 }
 
 void test_nghttp2_session_on_response_headers_received(void) {
@@ -2822,14 +2883,20 @@ void test_nghttp2_session_on_push_promise_received(void) {
   CU_ASSERT(1 == session->num_incoming_reserved_streams);
   CU_ASSERT(NULL == nghttp2_session_get_stream(session, 4));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(4 == item->frame.hd.stream_id);
+  CU_ASSERT(NGHTTP2_STREAM_CLOSED == item->frame.goaway.error_code);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.rst_stream.error_code);
   CU_ASSERT(0 == nghttp2_session_send(session));
   CU_ASSERT(4 == session->last_recv_stream_id);
 
+  nghttp2_session_del(session);
+
+  nghttp2_session_client_new(&session, &callbacks, &user_data);
+
+  stream = nghttp2_session_open_stream(session, 1, NGHTTP2_STREAM_FLAG_NONE,
+                                       &pri_spec_default,
+                                       NGHTTP2_STREAM_OPENING, NULL);
+
   /* Attempt to PUSH_PROMISE against stream in closing state */
-  stream->shut_flags = NGHTTP2_SHUT_NONE;
   stream->state = NGHTTP2_STREAM_CLOSING;
   frame.push_promise.promised_stream_id = 6;
 
@@ -2839,7 +2906,7 @@ void test_nghttp2_session_on_push_promise_received(void) {
             nghttp2_session_on_push_promise_received(session, &frame));
 
   CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  CU_ASSERT(0 == session->num_incoming_reserved_streams);
   CU_ASSERT(NULL == nghttp2_session_get_stream(session, 6));
   item = nghttp2_session_get_next_ob_item(session);
   CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
@@ -2847,7 +2914,7 @@ void test_nghttp2_session_on_push_promise_received(void) {
   CU_ASSERT(NGHTTP2_CANCEL == item->frame.rst_stream.error_code);
   CU_ASSERT(0 == nghttp2_session_send(session));
 
-  /* Attempt to PUSH_PROMISE against non-existent stream */
+  /* Attempt to PUSH_PROMISE against idle stream */
   frame.hd.stream_id = 3;
   frame.push_promise.promised_stream_id = 8;
 
@@ -2857,7 +2924,7 @@ void test_nghttp2_session_on_push_promise_received(void) {
             nghttp2_session_on_push_promise_received(session, &frame));
 
   CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  CU_ASSERT(0 == session->num_incoming_reserved_streams);
   CU_ASSERT(NULL == nghttp2_session_get_stream(session, 8));
   item = nghttp2_session_get_next_ob_item(session);
   CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
@@ -3241,6 +3308,53 @@ void test_nghttp2_session_on_data_received(void) {
   nghttp2_session_del(session);
 }
 
+void test_nghttp2_session_on_data_received_fail_fast(void) {
+  nghttp2_session *session;
+  nghttp2_session_callbacks callbacks;
+  uint8_t buf[9];
+  nghttp2_stream *stream;
+  nghttp2_frame_hd hd;
+  nghttp2_outbound_item *item;
+
+  memset(&callbacks, 0, sizeof(callbacks));
+
+  nghttp2_frame_hd_init(&hd, 0, NGHTTP2_DATA, NGHTTP2_FLAG_NONE, 1);
+  nghttp2_frame_pack_frame_hd(buf, &hd);
+
+  nghttp2_session_server_new(&session, &callbacks, NULL);
+
+  /* DATA to closed (remote) */
+  stream = open_stream(session, 1);
+  nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
+
+  CU_ASSERT((ssize_t)sizeof(buf) ==
+            nghttp2_session_mem_recv(session, buf, sizeof(buf)));
+
+  item = nghttp2_session_get_next_ob_item(session);
+
+  CU_ASSERT(NULL != item);
+  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+
+  nghttp2_session_del(session);
+
+  nghttp2_session_server_new(&session, &callbacks, NULL);
+
+  /* DATA to closed stream with explicit closed (remote) */
+  stream = open_stream(session, 1);
+  nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
+  nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR);
+
+  CU_ASSERT((ssize_t)sizeof(buf) ==
+            nghttp2_session_mem_recv(session, buf, sizeof(buf)));
+
+  item = nghttp2_session_get_next_ob_item(session);
+
+  CU_ASSERT(NULL != item);
+  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+
+  nghttp2_session_del(session);
+}
+
 void test_nghttp2_session_send_headers_start_stream(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
@@ -3984,6 +4098,7 @@ void test_nghttp2_submit_request_without_data(void) {
   nva_out out;
   nghttp2_bufs bufs;
   nghttp2_mem *mem;
+  nghttp2_priority_spec pri_spec;
 
   mem = nghttp2_mem_default();
   frame_pack_bufs_init(&bufs);
@@ -4017,6 +4132,15 @@ void test_nghttp2_submit_request_without_data(void) {
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_inflate_free(&inflater);
+
+  /* Try to depend on itself is error */
+  nghttp2_priority_spec_init(&pri_spec, (int32_t)session->next_stream_id, 16,
+                             0);
+
+  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
+            nghttp2_submit_request(session, &pri_spec, reqnv, ARRLEN(reqnv),
+                                   NULL, NULL));
+
   nghttp2_session_del(session);
 }
 
@@ -4308,6 +4432,7 @@ void test_nghttp2_submit_headers(void) {
   nva_out out;
   nghttp2_bufs bufs;
   nghttp2_mem *mem;
+  nghttp2_priority_spec pri_spec;
 
   mem = nghttp2_mem_default();
   frame_pack_bufs_init(&bufs);
@@ -4362,6 +4487,21 @@ void test_nghttp2_submit_headers(void) {
   nghttp2_frame_headers_free(&frame.headers, mem);
 
   nghttp2_hd_inflate_free(&inflater);
+
+  /* Try to depend on itself */
+  nghttp2_priority_spec_init(&pri_spec, 3, 16, 0);
+
+  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
+            nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 3, &pri_spec,
+                                   reqnv, ARRLEN(reqnv), NULL));
+
+  session->next_stream_id = 5;
+  nghttp2_priority_spec_init(&pri_spec, 5, 16, 0);
+
+  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
+            nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, -1, &pri_spec,
+                                   reqnv, ARRLEN(reqnv), NULL));
+
   nghttp2_session_del(session);
 }
 
@@ -5318,38 +5458,6 @@ void test_nghttp2_session_max_concurrent_streams(void) {
   nghttp2_session_del(session);
 }
 
-/*
- * Check that on_stream_close_callback is called when server pushed
- * HEADERS have NGHTTP2_FLAG_END_STREAM.
- */
-void test_nghttp2_session_stream_close_on_headers_push(void) {
-  /* nghttp2_session *session; */
-  /* nghttp2_session_callbacks callbacks; */
-  /* const char *nv[] = { NULL }; */
-  /* my_user_data ud; */
-  /* nghttp2_frame frame; */
-
-  /* memset(&callbacks, 0, sizeof(nghttp2_session_callbacks)); */
-  /* callbacks.on_stream_close_callback = */
-  /*   no_stream_user_data_stream_close_callback; */
-  /* ud.stream_close_cb_called = 0; */
-
-  /* nghttp2_session_client_new(&session, NGHTTP2_PROTO_SPDY2, &callbacks, &ud);
-   */
-  /* nghttp2_session_open_stream(session, 1, NGHTTP2_CTRL_FLAG_NONE, 3, */
-  /*                             NGHTTP2_STREAM_OPENING, NULL); */
-  /* nghttp2_frame_syn_stream_init(&frame.syn_stream, NGHTTP2_PROTO_SPDY2, */
-  /*                               NGHTTP2_CTRL_FLAG_FIN | */
-  /*                               NGHTTP2_CTRL_FLAG_UNIDIRECTIONAL, */
-  /*                               2, 1, 3, dup_nv(nv)); */
-
-  /* CU_ASSERT(0 == nghttp2_session_on_request_headers_received(session,
-   * &frame)); */
-
-  /* nghttp2_frame_syn_stream_free(&frame.syn_stream); */
-  /* nghttp2_session_del(session); */
-}
-
 void test_nghttp2_session_stop_data_with_rst_stream(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
@@ -7746,7 +7854,7 @@ void test_nghttp2_session_keep_closed_stream(void) {
   nghttp2_session_callbacks callbacks;
   const size_t max_concurrent_streams = 5;
   nghttp2_settings_entry iv = {NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS,
-                               max_concurrent_streams};
+                               (uint32_t)max_concurrent_streams};
   size_t i;
 
   memset(&callbacks, 0, sizeof(callbacks));
@@ -7781,6 +7889,7 @@ void test_nghttp2_session_keep_closed_stream(void) {
   CU_ASSERT(NULL == session->closed_stream_head->closed_prev);
 
   open_stream(session, 11);
+  nghttp2_session_adjust_closed_stream(session);
 
   CU_ASSERT(1 == session->num_closed_streams);
   CU_ASSERT(5 == session->closed_stream_tail->stream_id);
@@ -7789,6 +7898,7 @@ void test_nghttp2_session_keep_closed_stream(void) {
   CU_ASSERT(NULL == session->closed_stream_head->closed_next);
 
   open_stream(session, 13);
+  nghttp2_session_adjust_closed_stream(session);
 
   CU_ASSERT(0 == session->num_closed_streams);
   CU_ASSERT(NULL == session->closed_stream_tail);
@@ -7801,6 +7911,7 @@ void test_nghttp2_session_keep_closed_stream(void) {
 
   /* server initiated stream is not counted to max concurrent limit */
   open_stream(session, 2);
+  nghttp2_session_adjust_closed_stream(session);
 
   CU_ASSERT(1 == session->num_closed_streams);
   CU_ASSERT(3 == session->closed_stream_head->stream_id);
@@ -7818,8 +7929,9 @@ void test_nghttp2_session_keep_idle_stream(void) {
   nghttp2_session_callbacks callbacks;
   const size_t max_concurrent_streams = 1;
   nghttp2_settings_entry iv = {NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS,
-                               max_concurrent_streams};
+                               (uint32_t)max_concurrent_streams};
   int i;
+  int32_t stream_id;
 
   memset(&callbacks, 0, sizeof(callbacks));
   callbacks.send_callback = null_send_callback;
@@ -7828,25 +7940,29 @@ void test_nghttp2_session_keep_idle_stream(void) {
 
   nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1);
 
-  /* We at least allow 2 idle streams even if max concurrent streams
+  /* We at least allow NGHTTP2_MIN_IDLE_STREAM idle streams even if
-     is very low. */
+     max concurrent streams is very low. */
-  for (i = 0; i < 2; ++i) {
+  for (i = 0; i < NGHTTP2_MIN_IDLE_STREAMS; ++i) {
     nghttp2_session_open_stream(session, i * 2 + 1, NGHTTP2_STREAM_FLAG_NONE,
                                 &pri_spec_default, NGHTTP2_STREAM_IDLE, NULL);
+    nghttp2_session_adjust_idle_stream(session);
   }
 
-  CU_ASSERT(2 == session->num_idle_streams);
+  CU_ASSERT(NGHTTP2_MIN_IDLE_STREAMS == session->num_idle_streams);
 
+  stream_id = (NGHTTP2_MIN_IDLE_STREAMS - 1) * 2 + 1;
   CU_ASSERT(1 == session->idle_stream_head->stream_id);
-  CU_ASSERT(3 == session->idle_stream_tail->stream_id);
+  CU_ASSERT(stream_id == session->idle_stream_tail->stream_id);
 
-  nghttp2_session_open_stream(session, 5, NGHTTP2_FLAG_NONE, &pri_spec_default,
+  stream_id += 2;
-                              NGHTTP2_STREAM_IDLE, NULL);
 
-  CU_ASSERT(2 == session->num_idle_streams);
+  nghttp2_session_open_stream(session, stream_id, NGHTTP2_FLAG_NONE,
+                              &pri_spec_default, NGHTTP2_STREAM_IDLE, NULL);
+  nghttp2_session_adjust_idle_stream(session);
 
+  CU_ASSERT(NGHTTP2_MIN_IDLE_STREAMS == session->num_idle_streams);
   CU_ASSERT(3 == session->idle_stream_head->stream_id);
-  CU_ASSERT(5 == session->idle_stream_tail->stream_id);
+  CU_ASSERT(stream_id == session->idle_stream_tail->stream_id);
 
   nghttp2_session_del(session);
 }
@@ -8639,7 +8755,7 @@ void test_nghttp2_session_flooding(void) {
 void test_nghttp2_session_change_stream_priority(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_stream *stream1, *stream2, *stream3;
+  nghttp2_stream *stream1, *stream2, *stream3, *stream5;
   nghttp2_priority_spec pri_spec;
   int rv;
 
@@ -8672,6 +8788,41 @@ void test_nghttp2_session_change_stream_priority(void) {
   rv = nghttp2_session_change_stream_priority(session, 0, &pri_spec);
   CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
 
+  /* Depends on the non-existing idle stream.  This creates that idle
+     stream. */
+  nghttp2_priority_spec_init(&pri_spec, 5, 9, 1);
+
+  rv = nghttp2_session_change_stream_priority(session, 2, &pri_spec);
+
+  CU_ASSERT(0 == rv);
+
+  stream5 = nghttp2_session_get_stream_raw(session, 5);
+
+  CU_ASSERT(NULL != stream5);
+  CU_ASSERT(&session->root == stream5->dep_prev);
+  CU_ASSERT(stream5 == stream2->dep_prev);
+  CU_ASSERT(9 == stream2->weight);
+
+  nghttp2_session_del(session);
+
+  /* Check that this works in client session too */
+  nghttp2_session_client_new(&session, &callbacks, NULL);
+
+  stream1 = open_stream(session, 1);
+
+  nghttp2_priority_spec_init(&pri_spec, 5, 9, 1);
+
+  rv = nghttp2_session_change_stream_priority(session, 1, &pri_spec);
+
+  CU_ASSERT(0 == rv);
+
+  stream5 = nghttp2_session_get_stream_raw(session, 5);
+
+  CU_ASSERT(NULL != stream5);
+  CU_ASSERT(&session->root == stream5->dep_prev);
+  CU_ASSERT(stream5 == stream1->dep_prev);
+  CU_ASSERT(9 == stream1->weight);
+
   nghttp2_session_del(session);
 }
 
@@ -8681,8 +8832,10 @@ void test_nghttp2_session_create_idle_stream(void) {
   nghttp2_stream *stream2, *stream4, *stream8, *stream10;
   nghttp2_priority_spec pri_spec;
   int rv;
+  int i;
 
   memset(&callbacks, 0, sizeof(callbacks));
+  callbacks.send_callback = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -8744,6 +8897,170 @@ void test_nghttp2_session_create_idle_stream(void) {
   CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
 
   nghttp2_session_del(session);
+
+  /* Check that this works in client session too */
+  nghttp2_session_client_new(&session, &callbacks, NULL);
+
+  nghttp2_priority_spec_init(&pri_spec, 4, 99, 1);
+
+  rv = nghttp2_session_create_idle_stream(session, 2, &pri_spec);
+
+  CU_ASSERT(0 == rv);
+
+  stream4 = nghttp2_session_get_stream_raw(session, 4);
+  stream2 = nghttp2_session_get_stream_raw(session, 2);
+
+  CU_ASSERT(NULL != stream4);
+  CU_ASSERT(NULL != stream2);
+  CU_ASSERT(&session->root == stream4->dep_prev);
+  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream4->weight);
+  CU_ASSERT(stream4 == stream2->dep_prev);
+  CU_ASSERT(99 == stream2->weight);
+
+  nghttp2_session_del(session);
+
+  /* Check that idle stream is reduced when nghttp2_session_send() is
+     called. */
+  nghttp2_session_server_new(&session, &callbacks, NULL);
+
+  session->local_settings.max_concurrent_streams = 30;
+
+  nghttp2_priority_spec_init(&pri_spec, 0, 16, 0);
+  for (i = 0; i < 100; ++i) {
+    rv = nghttp2_session_create_idle_stream(session, i * 2 + 1, &pri_spec);
+
+    CU_ASSERT(0 == rv);
+
+    nghttp2_priority_spec_init(&pri_spec, i * 2 + 1, 16, 0);
+  }
+
+  CU_ASSERT(100 == session->num_idle_streams);
+  CU_ASSERT(0 == nghttp2_session_send(session));
+  CU_ASSERT(30 == session->num_idle_streams);
+  CU_ASSERT(141 == session->idle_stream_head->stream_id);
+
+  nghttp2_session_del(session);
+
+  /* Check that idle stream is reduced when nghttp2_session_mem_recv() is
+     called. */
+  nghttp2_session_client_new(&session, &callbacks, NULL);
+
+  session->local_settings.max_concurrent_streams = 30;
+
+  nghttp2_priority_spec_init(&pri_spec, 0, 16, 0);
+  for (i = 0; i < 100; ++i) {
+    rv = nghttp2_session_create_idle_stream(session, i * 2 + 1, &pri_spec);
+
+    CU_ASSERT(0 == rv);
+
+    nghttp2_priority_spec_init(&pri_spec, i * 2 + 1, 16, 0);
+  }
+
+  CU_ASSERT(100 == session->num_idle_streams);
+  CU_ASSERT(0 == nghttp2_session_mem_recv(session, NULL, 0));
+  CU_ASSERT(30 == session->num_idle_streams);
+  CU_ASSERT(141 == session->idle_stream_head->stream_id);
+
+  nghttp2_session_del(session);
+}
+
+void test_nghttp2_session_repeated_priority_change(void) {
+  nghttp2_session *session;
+  nghttp2_session_callbacks callbacks;
+  nghttp2_frame frame;
+  nghttp2_priority_spec pri_spec;
+  int32_t stream_id, last_stream_id;
+  int32_t max_streams = 20;
+
+  memset(&callbacks, 0, sizeof(callbacks));
+
+  nghttp2_session_server_new(&session, &callbacks, NULL);
+
+  session->local_settings.max_concurrent_streams = (uint32_t)max_streams;
+
+  /* 1 -> 0 */
+  nghttp2_priority_spec_init(&pri_spec, 0, 16, 0);
+  nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
+
+  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+
+  nghttp2_frame_priority_free(&frame.priority);
+
+  last_stream_id = max_streams * 2 + 1;
+
+  for (stream_id = 3; stream_id < last_stream_id; stream_id += 2) {
+    /* 1 -> stream_id */
+    nghttp2_priority_spec_init(&pri_spec, stream_id, 16, 0);
+    nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
+
+    CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+
+    nghttp2_frame_priority_free(&frame.priority);
+  }
+
+  CU_ASSERT(20 == session->num_idle_streams);
+  CU_ASSERT(1 == session->idle_stream_head->stream_id);
+
+  /* 1 -> last_stream_id */
+  nghttp2_priority_spec_init(&pri_spec, last_stream_id, 16, 0);
+  nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
+
+  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+
+  nghttp2_frame_priority_free(&frame.priority);
+
+  CU_ASSERT(20 == session->num_idle_streams);
+  CU_ASSERT(3 == session->idle_stream_head->stream_id);
+
+  nghttp2_session_del(session);
+}
+
+void test_nghttp2_session_repeated_priority_submission(void) {
+  nghttp2_session *session;
+  nghttp2_session_callbacks callbacks;
+  nghttp2_priority_spec pri_spec;
+  int32_t stream_id, last_stream_id;
+  uint32_t max_streams = NGHTTP2_MIN_IDLE_STREAMS;
+
+  memset(&callbacks, 0, sizeof(callbacks));
+
+  callbacks.send_callback = null_send_callback;
+
+  nghttp2_session_client_new(&session, &callbacks, NULL);
+
+  session->local_settings.max_concurrent_streams = max_streams;
+
+  /* 1 -> 0 */
+  nghttp2_priority_spec_init(&pri_spec, 0, 16, 0);
+
+  CU_ASSERT(0 ==
+            nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
+
+  last_stream_id = (int32_t)(max_streams * 2 + 1);
+
+  for (stream_id = 3; stream_id < last_stream_id; stream_id += 2) {
+    /* 1 -> stream_id */
+    nghttp2_priority_spec_init(&pri_spec, stream_id, 16, 0);
+
+    CU_ASSERT(
+        0 == nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
+  }
+
+  CU_ASSERT(0 == nghttp2_session_send(session));
+  CU_ASSERT(max_streams == session->num_idle_streams);
+  CU_ASSERT(1 == session->idle_stream_head->stream_id);
+
+  /* 1 -> last_stream_id */
+  nghttp2_priority_spec_init(&pri_spec, last_stream_id, 16, 0);
+
+  CU_ASSERT(0 ==
+            nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
+
+  CU_ASSERT(0 == nghttp2_session_send(session));
+  CU_ASSERT(max_streams == session->num_idle_streams);
+  CU_ASSERT(3 == session->idle_stream_head->stream_id);
+
+  nghttp2_session_del(session);
 }
 
 static void check_nghttp2_http_recv_headers_fail(

tests/nghttp2_session_test.h

@@ -34,6 +34,7 @@ void test_nghttp2_session_recv_data_no_auto_flow_control(void);
 void test_nghttp2_session_recv_continuation(void);
 void test_nghttp2_session_recv_headers_with_priority(void);
 void test_nghttp2_session_recv_headers_early_response(void);
+void test_nghttp2_session_server_recv_push_response(void);
 void test_nghttp2_session_recv_premature_headers(void);
 void test_nghttp2_session_recv_unknown_frame(void);
 void test_nghttp2_session_recv_unexpected_continuation(void);
@@ -54,6 +55,7 @@ void test_nghttp2_session_on_ping_received(void);
 void test_nghttp2_session_on_goaway_received(void);
 void test_nghttp2_session_on_window_update_received(void);
 void test_nghttp2_session_on_data_received(void);
+void test_nghttp2_session_on_data_received_fail_fast(void);
 void test_nghttp2_session_send_headers_start_stream(void);
 void test_nghttp2_session_send_headers_reply(void);
 void test_nghttp2_session_send_headers_frame_size_error(void);
@@ -95,7 +97,6 @@ void test_nghttp2_session_get_next_ob_item(void);
 void test_nghttp2_session_pop_next_ob_item(void);
 void test_nghttp2_session_reply_fail(void);
 void test_nghttp2_session_max_concurrent_streams(void);
-void test_nghttp2_session_stream_close_on_headers_push(void);
 void test_nghttp2_session_stop_data_with_rst_stream(void);
 void test_nghttp2_session_defer_data(void);
 void test_nghttp2_session_flow_control(void);
@@ -139,6 +140,8 @@ void test_nghttp2_session_detach_item_from_closed_stream(void);
 void test_nghttp2_session_flooding(void);
 void test_nghttp2_session_change_stream_priority(void);
 void test_nghttp2_session_create_idle_stream(void);
+void test_nghttp2_session_repeated_priority_change(void);
+void test_nghttp2_session_repeated_priority_submission(void);
 void test_nghttp2_http_mandatory_headers(void);
 void test_nghttp2_http_content_length(void);
 void test_nghttp2_http_content_length_mismatch(void);

third-party/neverbleed

@@ -1 +1 @@
-Subproject commit 81eff20bd84b4d0dce2cbbd1a5ad1384d086423b
+Subproject commit 5c47587bc2855f2b9577a9bd369ed70088b77fec