nghttp2/doc/nghttpx.1

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.TH "NGHTTPX" "1" "March 24, 2015" "0.7.8" "nghttp2"
.SH NAME
nghttpx \- HTTP/2 experimental proxy
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.SH SYNOPSIS
.sp
\fBnghttpx\fP [OPTIONS]... [<PRIVATE_KEY> <CERT>]
.SH DESCRIPTION
.sp
A reverse proxy for HTTP/2, HTTP/1 and SPDY.
.INDENT 0.0
.TP
.B <PRIVATE_KEY>
Set path  to server\(aqs private key.   Required unless \fI\%\-p\fP,
\fI\%\-\-client\fP or \fI\%\-\-frontend\-no\-tls\fP are given.
.UNINDENT
.INDENT 0.0
.TP
.B <CERT>
Set path  to server\(aqs certificate.  Required  unless \fI\%\-p\fP,
\fI\%\-\-client\fP or \fI\%\-\-frontend\-no\-tls\fP are given.
.UNINDENT
.SH OPTIONS
.sp
The options are categorized into several groups.
.SS Connections
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.B \-b, \-\-backend=<HOST,PORT>
Set  backend  host  and   port.   The  multiple  backend
addresses are  accepted by repeating this  option.  UNIX
domain socket  can be  specified by prefixing  path name
with "unix:" (e.g., unix:/var/run/backend.sock)
.sp
Default: \fB127.0.0.1,80\fP
.UNINDENT
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.B \-f, \-\-frontend=<HOST,PORT>
Set  frontend  host and  port.   If  <HOST> is  \(aq*\(aq,  it
assumes  all addresses  including  both  IPv4 and  IPv6.
UNIX domain  socket can  be specified by  prefixing path
name with "unix:" (e.g., unix:/var/run/nghttpx.sock)
.sp
Default: \fB*,3000\fP
.UNINDENT
.INDENT 0.0
.TP
.B \-\-backlog=<N>
Set listen backlog size.
.sp
Default: \fB512\fP
.UNINDENT
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.TP
.B \-\-backend\-ipv4
Resolve backend hostname to IPv4 address only.
.UNINDENT
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.B \-\-backend\-ipv6
Resolve backend hostname to IPv6 address only.
.UNINDENT
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.B \-\-backend\-http\-proxy\-uri=<URI>
Specify      proxy       URI      in       the      form
\fI\%http:/\fP/[<USER>:<PASS>@]<PROXY>:<PORT>.    If   a   proxy
requires  authentication,  specify  <USER>  and  <PASS>.
Note that  they must be properly  percent\-encoded.  This
proxy  is used  when the  backend connection  is HTTP/2.
First,  make  a CONNECT  request  to  the proxy  and  it
connects  to the  backend  on behalf  of nghttpx.   This
forms  tunnel.   After  that, nghttpx  performs  SSL/TLS
handshake with  the downstream through the  tunnel.  The
timeouts when connecting and  making CONNECT request can
be     specified    by     \fI\%\-\-backend\-read\-timeout\fP    and
\fI\%\-\-backend\-write\-timeout\fP options.
.UNINDENT
.SS Performance
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.TP
.B \-n, \-\-workers=<N>
Set the number of worker threads.
.sp
Default: \fB1\fP
.UNINDENT
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.B \-\-read\-rate=<SIZE>
Set maximum  average read  rate on  frontend connection.
Setting 0 to this option means read rate is unlimited.
.sp
Default: \fB0\fP
.UNINDENT
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.B \-\-read\-burst=<SIZE>
Set  maximum read  burst  size  on frontend  connection.
Setting  0  to this  option  means  read burst  size  is
unlimited.
.sp
Default: \fB0\fP
.UNINDENT
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.B \-\-write\-rate=<SIZE>
Set maximum  average write rate on  frontend connection.
Setting 0 to this option means write rate is unlimited.
.sp
Default: \fB0\fP
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.B \-\-write\-burst=<SIZE>
Set  maximum write  burst size  on frontend  connection.
Setting  0 to  this  option means  write  burst size  is
unlimited.
.sp
Default: \fB0\fP
.UNINDENT
.INDENT 0.0
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.B \-\-worker\-read\-rate=<SIZE>
Set maximum average read rate on frontend connection per
worker.  Setting  0 to  this option  means read  rate is
unlimited.  Not implemented yet.
.sp
Default: \fB0\fP
.UNINDENT
.INDENT 0.0
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.B \-\-worker\-read\-burst=<SIZE>
Set maximum  read burst size on  frontend connection per
worker.  Setting 0 to this  option means read burst size
is unlimited.  Not implemented yet.
.sp
Default: \fB0\fP
.UNINDENT
.INDENT 0.0
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.B \-\-worker\-write\-rate=<SIZE>
Set maximum  average write  rate on  frontend connection
per worker.  Setting  0 to this option  means write rate
is unlimited.  Not implemented yet.
.sp
Default: \fB0\fP
.UNINDENT
.INDENT 0.0
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.B \-\-worker\-write\-burst=<SIZE>
Set maximum write burst  size on frontend connection per
worker.  Setting 0 to this option means write burst size
is unlimited.  Not implemented yet.
.sp
Default: \fB0\fP
.UNINDENT
.INDENT 0.0
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.B \-\-worker\-frontend\-connections=<N>
Set maximum number  of simultaneous connections frontend
accepts.  Setting 0 means unlimited.
.sp
Default: \fB0\fP
.UNINDENT
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.B \-\-backend\-http2\-connections\-per\-worker=<N>
Set  maximum number  of HTTP/2  connections per  worker.
The  default  value is  0,  which  means the  number  of
backend addresses specified by \fI\%\-b\fP option.
.UNINDENT
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.B \-\-backend\-http1\-connections\-per\-host=<N>
Set   maximum  number   of  backend   concurrent  HTTP/1
connections per host.  This option is meaningful when \fI\%\-s\fP
option is used.  To limit  the number of connections per
frontend        for       default        mode,       use
\fI\%\-\-backend\-http1\-connections\-per\-frontend\fP\&.
.sp
Default: \fB8\fP
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.B \-\-backend\-http1\-connections\-per\-frontend=<N>
Set   maximum  number   of  backend   concurrent  HTTP/1
connections per frontend.  This  option is only used for
default mode.   0 means unlimited.  To  limit the number
of connections  per host for  HTTP/2 or SPDY  proxy mode
(\-s option), use \fI\%\-\-backend\-http1\-connections\-per\-host\fP\&.
.sp
Default: \fB0\fP
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.B \-\-rlimit\-nofile=<N>
Set maximum number of open files (RLIMIT_NOFILE) to <N>.
If 0 is given, nghttpx does not set the limit.
.sp
Default: \fB0\fP
.UNINDENT
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.B \-\-backend\-request\-buffer=<SIZE>
Set buffer size used to store backend request.
.sp
Default: \fB16K\fP
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.B \-\-backend\-response\-buffer=<SIZE>
Set buffer size used to store backend response.
.sp
Default: \fB16K\fP
.UNINDENT
.SS Timeout
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.B \-\-frontend\-http2\-read\-timeout=<DURATION>
Specify  read  timeout  for  HTTP/2  and  SPDY  frontend
connection.
.sp
Default: \fB180s\fP
.UNINDENT
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.B \-\-frontend\-read\-timeout=<DURATION>
Specify read timeout for HTTP/1.1 frontend connection.
.sp
Default: \fB180s\fP
.UNINDENT
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.B \-\-frontend\-write\-timeout=<DURATION>
Specify write timeout for all frontend connections.
.sp
Default: \fB30s\fP
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.B \-\-stream\-read\-timeout=<DURATION>
Specify  read timeout  for HTTP/2  and SPDY  streams.  0
means no timeout.
.sp
Default: \fB0\fP
.UNINDENT
.INDENT 0.0
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.B \-\-stream\-write\-timeout=<DURATION>
Specify write  timeout for  HTTP/2 and SPDY  streams.  0
means no timeout.
.sp
Default: \fB0\fP
.UNINDENT
.INDENT 0.0
.TP
.B \-\-backend\-read\-timeout=<DURATION>
Specify read timeout for backend connection.
.sp
Default: \fB180s\fP
.UNINDENT
.INDENT 0.0
.TP
.B \-\-backend\-write\-timeout=<DURATION>
Specify write timeout for backend connection.
.sp
Default: \fB30s\fP
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.B \-\-backend\-keep\-alive\-timeout=<DURATION>
Specify keep\-alive timeout for backend connection.
.sp
Default: \fB2s\fP
.UNINDENT
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.B \-\-listener\-disable\-timeout=<DURATION>
After accepting  connection failed,  connection listener
is disabled  for a given  amount of time.   Specifying 0
disables this feature.
.sp
Default: \fB0\fP
.UNINDENT
.SS SSL/TLS
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.B \-\-ciphers=<SUITE>
Set allowed  cipher list.  The  format of the  string is
described in OpenSSL ciphers(1).
.UNINDENT
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.TP
.B \-k, \-\-insecure
Don\(aqt  verify   backend  server\(aqs  certificate   if  \fI\%\-p\fP,
\fI\%\-\-client\fP    or    \fI\%\-\-http2\-bridge\fP     are    given    and
\fI\%\-\-backend\-no\-tls\fP is not given.
.UNINDENT
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.B \-\-cacert=<PATH>
Set path to trusted CA  certificate file if \fI\%\-p\fP, \fI\%\-\-client\fP
or \fI\%\-\-http2\-bridge\fP are given  and \fI\%\-\-backend\-no\-tls\fP is not
given.  The file must be  in PEM format.  It can contain
multiple  certificates.    If  the  linked   OpenSSL  is
configured to  load system  wide certificates,  they are
loaded at startup regardless of this option.
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.B \-\-private\-key\-passwd\-file=<PATH>
Path  to file  that contains  password for  the server\(aqs
private key.   If none is  given and the private  key is
password protected it\(aqll be requested interactively.
.UNINDENT
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.B \-\-subcert=<KEYPATH>:<CERTPATH>
Specify  additional certificate  and  private key  file.
nghttpx will  choose certificates based on  the hostname
indicated  by  client  using TLS  SNI  extension.   This
option can be used multiple times.
.UNINDENT
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.B \-\-backend\-tls\-sni\-field=<HOST>
Explicitly  set the  content of  the TLS  SNI extension.
This will default to the backend HOST name.
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.B \-\-dh\-param\-file=<PATH>
Path to file that contains  DH parameters in PEM format.
Without  this   option,  DHE   cipher  suites   are  not
available.
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.TP
.B \-\-npn\-list=<LIST>
Comma delimited list of  ALPN protocol identifier sorted
in the  order of preference.  That  means most desirable
protocol comes  first.  This  is used  in both  ALPN and
NPN.  The parameter must be  delimited by a single comma
only  and any  white spaces  are  treated as  a part  of
protocol string.
.sp
Default: \fBh2,h2\-16,h2\-14,spdy/3.1,http/1.1\fP
.UNINDENT
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.B \-\-verify\-client
Require and verify client certificate.
.UNINDENT
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.B \-\-verify\-client\-cacert=<PATH>
Path  to file  that contains  CA certificates  to verify
client certificate.  The file must be in PEM format.  It
can contain multiple certificates.
.UNINDENT
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.TP
.B \-\-client\-private\-key\-file=<PATH>
Path to  file that contains  client private key  used in
backend client authentication.
.UNINDENT
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.B \-\-client\-cert\-file=<PATH>
Path to  file that  contains client certificate  used in
backend client authentication.
.UNINDENT
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.TP
.B \-\-tls\-proto\-list=<LIST>
Comma delimited list of  SSL/TLS protocol to be enabled.
The following protocols  are available: TLSv1.2, TLSv1.1
and   TLSv1.0.    The   name   matching   is   done   in
case\-insensitive   manner.    The  parameter   must   be
delimited by  a single comma  only and any  white spaces
are treated as a part of protocol string.
.sp
Default: \fBTLSv1.2,TLSv1.1\fP
.UNINDENT
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.B \-\-tls\-ticket\-key\-file=<PATH>
Path  to file  that  contains 48  bytes  random data  to
construct TLS  session ticket parameters.   This options
can  be  used  repeatedly  to  specify  multiple  ticket
parameters.  If several files  are given, only the first
key is used to encrypt  TLS session tickets.  Other keys
are accepted  but server  will issue new  session ticket
with  first  key.   This allows  session  key  rotation.
Please   note  that   key   rotation   does  not   occur
automatically.   User should  rearrange files  or change
options  values  and  restart  nghttpx  gracefully.   If
opening or reading given file fails, all loaded keys are
discarded and it is treated as if none of this option is
given.  If this option is not given or an error occurred
while  opening  or  reading  a file,  key  is  generated
automatically and  renewed every 12hrs.  At  most 2 keys
are stored in memory.
.UNINDENT
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.TP
.B \-\-tls\-ctx\-per\-worker
Create OpenSSL\(aqs SSL_CTX per worker, so that no internal
locking is required.  This  may improve scalability with
multi  threaded   configuration.   If  this   option  is
enabled, session ID is  no longer shared accross SSL_CTX
objects, which means session  ID generated by one worker
is not acceptable by another worker.  On the other hand,
session ticket key is shared across all worker threads.
.UNINDENT
.SS HTTP/2 and SPDY
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.TP
.B \-c, \-\-http2\-max\-concurrent\-streams=<N>
Set the maximum number of  the concurrent streams in one
HTTP/2 and SPDY session.
.sp
Default: \fB100\fP
.UNINDENT
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.TP
.B \-\-frontend\-http2\-window\-bits=<N>
Sets the  per\-stream initial window size  of HTTP/2 SPDY
frontend connection.  For HTTP/2,  the size is 2**<N>\-1.
For SPDY, the size is 2**<N>.
.sp
Default: \fB16\fP
.UNINDENT
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.TP
.B \-\-frontend\-http2\-connection\-window\-bits=<N>
Sets the  per\-connection window size of  HTTP/2 and SPDY
frontend   connection.    For   HTTP/2,  the   size   is
2**<N>\-1. For SPDY, the size is 2**<N>.
.sp
Default: \fB16\fP
.UNINDENT
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.B \-\-frontend\-no\-tls
Disable SSL/TLS on frontend connections.
.UNINDENT
.INDENT 0.0
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.B \-\-backend\-http2\-window\-bits=<N>
Sets  the   initial  window   size  of   HTTP/2  backend
connection to 2**<N>\-1.
.sp
Default: \fB16\fP
.UNINDENT
.INDENT 0.0
.TP
.B \-\-backend\-http2\-connection\-window\-bits=<N>
Sets the  per\-connection window  size of  HTTP/2 backend
connection to 2**<N>\-1.
.sp
Default: \fB16\fP
.UNINDENT
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.B \-\-backend\-no\-tls
Disable SSL/TLS on backend connections.
.UNINDENT
.INDENT 0.0
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.B \-\-http2\-no\-cookie\-crumbling
Don\(aqt crumble cookie header field.
.UNINDENT
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.B \-\-padding=<N>
Add  at most  <N> bytes  to  a HTTP/2  frame payload  as
padding.  Specify 0 to  disable padding.  This option is
meant for debugging purpose  and not intended to enhance
protocol security.
.UNINDENT
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.B \-\-no\-server\-push
Disable  HTTP/2  server  push.    Server  push  is  only
supported  by default  mode and  HTTP/2 frontend.   SPDY
frontend does not support server push.
.UNINDENT
.SS Mode
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.B (default mode)
Accept  HTTP/2,  SPDY  and HTTP/1.1  over  SSL/TLS.   If
\fI\%\-\-frontend\-no\-tls\fP is  used, accept HTTP/2  and HTTP/1.1.
The  incoming HTTP/1.1  connection  can  be upgraded  to
HTTP/2  through  HTTP  Upgrade.   The  protocol  to  the
backend is HTTP/1.1.
.UNINDENT
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.B \-s, \-\-http2\-proxy
Like default mode, but enable secure proxy mode.
.UNINDENT
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.B \-\-http2\-bridge
Like default  mode, but communicate with  the backend in
HTTP/2 over SSL/TLS.  Thus  the incoming all connections
are converted  to HTTP/2  connection and relayed  to the
backend.  See \fI\%\-\-backend\-http\-proxy\-uri\fP option if you are
behind  the proxy  and want  to connect  to the  outside
HTTP/2 proxy.
.UNINDENT
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.B \-\-client
Accept  HTTP/2   and  HTTP/1.1  without   SSL/TLS.   The
incoming HTTP/1.1  connection can be upgraded  to HTTP/2
connection through  HTTP Upgrade.   The protocol  to the
backend is HTTP/2.   To use nghttpx as  a forward proxy,
use \fI\%\-p\fP option instead.
.UNINDENT
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.B \-p, \-\-client\-proxy
Like \fI\%\-\-client\fP  option, but it also  requires the request
path from frontend must be an absolute URI, suitable for
use as a forward proxy.
.UNINDENT
.SS Logging
.INDENT 0.0
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.B \-L, \-\-log\-level=<LEVEL>
Set the severity  level of log output.   <LEVEL> must be
one of INFO, NOTICE, WARN, ERROR and FATAL.
.sp
Default: \fBNOTICE\fP
.UNINDENT
.INDENT 0.0
.TP
.B \-\-accesslog\-file=<PATH>
Set path to write access log.  To reopen file, send USR1
signal to nghttpx.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-accesslog\-syslog
Send  access log  to syslog.   If this  option is  used,
\fI\%\-\-accesslog\-file\fP option is ignored.
.UNINDENT
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.TP
.B \-\-accesslog\-format=<FORMAT>
Specify  format  string  for access  log.   The  default
format is combined format.   The following variables are
available:
.INDENT 7.0
.IP \(bu 2
$remote_addr: client IP address.
.IP \(bu 2
$time_local: local time in Common Log format.
.IP \(bu 2
$time_iso8601: local time in ISO 8601 format.
.IP \(bu 2
$request: HTTP request line.
.IP \(bu 2
$status: HTTP response status code.
.IP \(bu 2
$body_bytes_sent: the  number of bytes sent  to client
as response body.
.IP \(bu 2
$http_<VAR>: value of HTTP  request header <VAR> where
\(aq_\(aq in <VAR> is replaced with \(aq\-\(aq.
.IP \(bu 2
$remote_port: client  port.
.IP \(bu 2
$server_port: server port.
.IP \(bu 2
$request_time: request processing time in seconds with
milliseconds resolution.
.IP \(bu 2
$pid: PID of the running process.
.IP \(bu 2
$alpn: ALPN identifier of the protocol which generates
the response.   For HTTP/1,  ALPN is  always http/1.1,
regardless of minor version.
.UNINDENT
.sp
Default: \fB$remote_addr \- \- [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent"\fP
.UNINDENT
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.B \-\-errorlog\-file=<PATH>
Set path to write error  log.  To reopen file, send USR1
signal to nghttpx.
.sp
Default: \fB/dev/stderr\fP
.UNINDENT
.INDENT 0.0
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.B \-\-errorlog\-syslog
Send  error log  to  syslog.  If  this  option is  used,
\fI\%\-\-errorlog\-file\fP option is ignored.
.UNINDENT
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.B \-\-syslog\-facility=<FACILITY>
Set syslog facility to <FACILITY>.
.sp
Default: \fBdaemon\fP
.UNINDENT
.SS HTTP
.INDENT 0.0
.TP
.B \-\-add\-x\-forwarded\-for
Append  X\-Forwarded\-For header  field to  the downstream
request.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-strip\-incoming\-x\-forwarded\-for
Strip X\-Forwarded\-For  header field from  inbound client
requests.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-no\-via
Don\(aqt append to  Via header field.  If  Via header field
is received, it is left unaltered.
.UNINDENT
.INDENT 0.0
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.B \-\-no\-location\-rewrite
Don\(aqt rewrite  location header field  on \fI\%\-\-http2\-bridge\fP,
\fI\%\-\-client\fP  and  default   mode.   For  \fI\%\-\-http2\-proxy\fP  and
\fI\%\-\-client\-proxy\fP mode,  location header field will  not be
altered regardless of this option.
.UNINDENT
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.B \-\-no\-host\-rewrite
Don\(aqt  rewrite  host  and :authority  header  fields  on
\fI\%\-\-http2\-bridge\fP,   \fI\%\-\-client\fP   and  default   mode.    For
\fI\%\-\-http2\-proxy\fP  and  \fI\%\-\-client\-proxy\fP mode,  these  headers
will not be altered regardless of this option.
.UNINDENT
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.B \-\-altsvc=<PROTOID,PORT[,HOST,[ORIGIN]]>
Specify   protocol  ID,   port,  host   and  origin   of
alternative service.  <HOST>  and <ORIGIN> are optional.
They are  advertised in  alt\-svc header field  or HTTP/2
ALTSVC frame.  This option can be used multiple times to
specify   multiple   alternative   services.    Example:
\fI\%\-\-altsvc\fP=h2,443
.UNINDENT
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.B \-\-add\-response\-header=<HEADER>
Specify  additional  header  field to  add  to  response
header set.   This option just appends  header field and
won\(aqt replace anything already  set.  This option can be
used several  times to  specify multiple  header fields.
Example: \fI\%\-\-add\-response\-header\fP="foo: bar"
.UNINDENT
.SS Debug
.INDENT 0.0
.TP
.B \-\-frontend\-http2\-dump\-request\-header=<PATH>
Dumps request headers received by HTTP/2 frontend to the
file denoted  in <PATH>.  The  output is done  in HTTP/1
header field format and each header block is followed by
an empty line.  This option  is not thread safe and MUST
NOT be used with option \fI\%\-n\fP<N>, where <N> >= 2.
.UNINDENT
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.B \-\-frontend\-http2\-dump\-response\-header=<PATH>
Dumps response headers sent  from HTTP/2 frontend to the
file denoted  in <PATH>.  The  output is done  in HTTP/1
header field format and each header block is followed by
an empty line.  This option  is not thread safe and MUST
NOT be used with option \fI\%\-n\fP<N>, where <N> >= 2.
.UNINDENT
.INDENT 0.0
.TP
.B \-o, \-\-frontend\-frame\-debug
Print HTTP/2 frames in  frontend to stderr.  This option
is  not thread  safe and  MUST NOT  be used  with option
\fI\%\-n\fP=N, where N >= 2.
.UNINDENT
.SS Process
.INDENT 0.0
.TP
.B \-D, \-\-daemon
Run in a background.  If \fI\%\-D\fP is used, the current working
directory is changed to \(aq\fI/\fP\(aq.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-pid\-file=<PATH>
Set path to save PID of this program.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-user=<USER>
Run this program as <USER>.   This option is intended to
be used to drop root privileges.
.UNINDENT
.SS Misc
.INDENT 0.0
.TP
.B \-\-conf=<PATH>
Load configuration from <PATH>.
.sp
Default: \fB/etc/nghttpx/nghttpx.conf\fP
.UNINDENT
.INDENT 0.0
.TP
.B \-v, \-\-version
Print version and exit.
.UNINDENT
.INDENT 0.0
.TP
.B \-h, \-\-help
Print this help and exit.
.UNINDENT
.sp
The <SIZE> argument is an integer and an optional unit (e.g., 10K is
10 * 1024).  Units are K, M and G (powers of 1024).
.sp
The <DURATION> argument is an integer and an optional unit (e.g., 1s
is 1 second and 500ms is 500  milliseconds).  Units are s or ms.  If
a unit is omitted, a second is used as unit.
.SH FILES
.INDENT 0.0
.TP
.B \fI/etc/nghttpx/nghttpx.conf\fP
The default configuration file path nghttpx searches at startup.
The configuration file path can be changed using \fI\%\-\-conf\fP
option.
.sp
Those lines which are staring \fB#\fP are treated as comment.
.sp
The option name in the configuration file is the long command\-line
option name with leading \fB\-\-\fP stripped (e.g., \fBfrontend\fP).  Put
\fB=\fP between option name and value.  Don\(aqt put extra leading or
trailing spaces.
.sp
The options which do not take argument in the command\-line \fItake\fP
argument in the configuration file.  Specify \fByes\fP as an argument
(e.g., \fBhttp2\-proxy=yes\fP).  If other string is given, it is
ignored.
.sp
To specify private key and certificate file which are given as
positional arguments in commnad\-line, use \fBprivate\-key\-file\fP and
\fBcertificate\-file\fP\&.
.sp
\fI\%\-\-conf\fP option cannot be used in the configuration file and
will be ignored if specified.
.UNINDENT
.SH SIGNALS
.INDENT 0.0
.TP
.B SIGQUIT
Shutdown gracefully.  First accept pending connections and stop
accepting connection.  After all connections are handled, nghttpx
exits.
.TP
.B SIGUSR1
Reopen log files.
.TP
.B SIGUSR2
Fork and execute nghttpx.  It will execute the binary in the same
path with same command\-line arguments and environment variables.
After new process comes up, sending SIGQUIT to the original process
to perform hot swapping.
.UNINDENT
.SH SERVER PUSH
.sp
nghttpx supports HTTP/2 server push in default mode.  nghttpx looks
for Link header field (\fI\%RFC 5988\fP) in response headers from
backend server and extracts URI\-reference with parameter
\fBrel=preload\fP (see \fI\%preload\fP)
and pushes those URIs to the frontend client. Here is a sample Link
header field to initiate server push:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
Link: </fonts/font.woff>; rel=preload
Link: </css/theme.css>; rel=preload
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Currently, the following restrictions are applied for server push:
.INDENT 0.0
.IP 1. 3
URI\-reference must not contain authority.  If it exists, it is not
pushed.  \fB/fonts/font.woff\fP and \fBcss/theme.css\fP are eligible to
be pushed.  \fBhttps://example.org/fonts/font.woff\fP and
\fB//example.org/css/theme.css\fP are not.
.IP 2. 3
The associated stream must have method "GET" or "POST".  The
associated stream\(aqs status code must be 200.
.UNINDENT
.sp
These limitations may be loosened in the future release.
.SH UNIX DOMAIN SOCKET
.sp
nghttpx supports UNIX domain socket with a filename for both frontend
and backend connections.
.sp
Please note that current nghttpx implementation does not delete a
socket with a filename.  And on start up, if nghttpx detects that the
specified socket already exists in the file system, nghttpx first
deletes it.  However, if SIGUSR2 is used to execute new binary and
both old and new configurations use same filename, new binary does not
delete the socket and continues to use it.
.SH SEE ALSO
.sp
\fInghttp(1)\fP, \fInghttpd(1)\fP, \fIh2load(1)\fP
.SH AUTHOR
Tatsuhiro Tsujikawa
.SH COPYRIGHT
2012, 2015, Tatsuhiro Tsujikawa
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