nghttp2/README.rst

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nghttp2 - HTTP/2 C Library
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==========================
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This is an implementation of the Hypertext Transfer Protocol version 2
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in C.
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The framing layer of HTTP/2 is implemented as a reusable C
library. On top of that, we have implemented an HTTP/2 client, server
and proxy. We have also developed load test and benchmarking tools for
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HTTP/2 and SPDY.
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An HPACK encoder and decoder are available as a public API.
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An experimental high level C++ library is also available.
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We have Python bindings of this libary, but we do not have full
code coverage yet.
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Development Status
------------------
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We started to implement h2-14
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(http://tools.ietf.org/html/draft-ietf-httpbis-http2-14), and header
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compression
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(http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-09).
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The nghttp2 code base was forked from the spdylay project.
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=========================== =======
HTTP/2 Features Support
=========================== =======
Core frames handling Yes
Dependency Tree Yes
Large header (CONTINUATION) Yes
=========================== =======
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Public Test Server
------------------
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The following endpoints are available to try out our nghttp2
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implementation.
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* https://nghttp2.org/ (TLS + ALPN/NPN)
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This endpoint supports ``h2``, ``h2-16``, ``h2-14``, ``spdy/3.1``
and ``http/1.1`` via ALPN/NPN and requires TLSv1.2 for HTTP/2
connection.
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* http://nghttp2.org/ (Upgrade / Direct)
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``h2c-14`` and ``http/1.1``.
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Requirements
------------
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The following package is required to build the libnghttp2 library:
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* pkg-config >= 0.20
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To build and run the unit test programs, the following package is
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required:
* cunit >= 2.1
To build the documentation, you need to install:
* sphinx (http://sphinx-doc.org/)
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To build and run the application programs (``nghttp``, ``nghttpd`` and
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``nghttpx``) in the ``src`` directory, the following packages are
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required:
* OpenSSL >= 1.0.1
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* libev >= 4.15
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* zlib >= 1.2.3
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ALPN support requires OpenSSL >= 1.0.2 (released 22 January 2015).
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To enable the SPDY protocol in the application program ``nghttpx`` and
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``h2load``, the following package is required:
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* spdylay >= 1.3.0
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To enable ``-a`` option (getting linked assets from the downloaded
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resource) in ``nghttp``, the following package is required:
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* libxml2 >= 2.7.7
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The HPACK tools require the following package:
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* jansson >= 2.5
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To build sources under the examples directory, libevent is required:
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* libevent-openssl >= 2.0.8
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To mitigate heap fragmentation in long running server programs
(``nghttpd`` and ``nghttpx``), jemalloc is recommended:
* jemalloc
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libnghttp2_asio C++ library requires the following packages:
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* libboost-dev >= 1.54.0
* libboost-thread-dev >= 1.54.0
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The Python bindings require the following packages:
* cython >= 0.19
* python >= 2.7
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If you are using Ubuntu 14.04 LTS (trusty), run the following to install the needed packages::
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sudo apt-get install make binutils autoconf automake autotools-dev libtool pkg-config \
zlib1g-dev libcunit1-dev libssl-dev libxml2-dev libev-dev libevent-dev libjansson-dev \
libjemalloc-dev cython python3.4-dev
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spdylay is not packaged in Ubuntu, so you need to build it yourself:
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http://tatsuhiro-t.github.io/spdylay/
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Building from git
-----------------
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Building from git is easy, but please be sure that at least autoconf 2.68 is
used::
$ autoreconf -i
$ automake
$ autoconf
$ ./configure
$ make
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To compile the source code, gcc >= 4.8.3 or clang >= 3.4 is required.
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.. note::
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Mac OS X users may need the ``--disable-threads`` configure option to
disable multi-threading in nghttpd, nghttpx and h2load to prevent
them from crashing. A patch is welcome to make multi threading work
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on Mac OS X platform.
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Building the documentation
--------------------------
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.. note::
Documentation is still incomplete.
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To build the documentation, run::
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$ make html
The documents will be generated under ``doc/manual/html/``.
The generated documents will not be installed with ``make install``.
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The online documentation is available at
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https://nghttp2.org/documentation/
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Unit tests
----------
Unit tests are done by simply running `make check`.
Integration tests
-----------------
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We have the integration tests for the nghttpx proxy server. The tests are
written in the `Go programming language <http://golang.org/>`_ and uses
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its testing framework. We depend on the following libraries:
* https://github.com/bradfitz/http2
* https://github.com/tatsuhiro-t/go-nghttp2
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* https://golang.org/x/net/spdy
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To download the above packages, after settings ``GOPATH``, run the
following command under ``integration-tests`` directory::
$ make itprep
To run the tests, run the following command under
``integration-tests`` directory::
$ make it
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Inside the tests, we use port 3009 to run the test subject server.
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Client, Server and Proxy programs
---------------------------------
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The ``src`` directory contains the HTTP/2 client, server and proxy programs.
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nghttp - client
+++++++++++++++
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``nghttp`` is a HTTP/2 client. It can connect to the HTTP/2 server
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with prior knowledge, HTTP Upgrade and NPN/ALPN TLS extension.
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It has verbose output mode for framing information. Here is sample
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output from ``nghttp`` client::
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$ nghttp -nv https://nghttp2.org
[ 0.033][NPN] server offers:
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* h2-14
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* spdy/3.1
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* http/1.1
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The negotiated protocol: h2-14
[ 0.068] send SETTINGS frame <length=15, flags=0x00, stream_id=0>
(niv=3)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
[SETTINGS_COMPRESS_DATA(5):1]
[ 0.068] send HEADERS frame <length=46, flags=0x05, stream_id=1>
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; END_STREAM | END_HEADERS
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(padlen=0)
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; Open new stream
:authority: nghttp2.org
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:method: GET
:path: /
:scheme: https
accept: */*
accept-encoding: gzip, deflate
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user-agent: nghttp2/0.4.0-DEV
[ 0.068] recv SETTINGS frame <length=10, flags=0x00, stream_id=0>
(niv=2)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
[ 0.068] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
(niv=0)
[ 0.079] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
(niv=0)
[ 0.080] (stream_id=1, noind=0) :status: 200
[ 0.080] (stream_id=1, noind=0) accept-ranges: bytes
[ 0.080] (stream_id=1, noind=0) age: 15
[ 0.080] (stream_id=1, noind=0) content-length: 40243
[ 0.080] (stream_id=1, noind=0) content-type: text/html
[ 0.080] (stream_id=1, noind=0) date: Wed, 14 May 2014 15:14:30 GMT
[ 0.080] (stream_id=1, noind=0) etag: "535d0eea-9d33"
[ 0.080] (stream_id=1, noind=0) last-modified: Sun, 27 Apr 2014 14:06:34 GMT
[ 0.080] (stream_id=1, noind=0) server: nginx/1.4.6 (Ubuntu)
[ 0.080] (stream_id=1, noind=0) x-varnish: 2114900538 2114900537
[ 0.080] (stream_id=1, noind=0) via: 1.1 varnish, 1.1 nghttpx
[ 0.080] (stream_id=1, noind=0) strict-transport-security: max-age=31536000
[ 0.080] recv HEADERS frame <length=162, flags=0x04, stream_id=1>
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; END_HEADERS
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(padlen=0)
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; First response header
[ 0.080] recv DATA frame <length=3786, flags=0x00, stream_id=1>
[ 0.080] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.081] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.093] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.093] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.094] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.094] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.094] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.096] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.096] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=0>
(window_size_increment=36554)
[ 0.096] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=1>
(window_size_increment=36554)
[ 0.108] recv DATA frame <length=3689, flags=0x00, stream_id=1>
[ 0.108] recv DATA frame <length=0, flags=0x01, stream_id=1>
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; END_STREAM
[ 0.108] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
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(last_stream_id=0, error_code=NO_ERROR(0), opaque_data(0)=[])
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The HTTP Upgrade is performed like this::
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$ nghttp -nvu http://nghttp2.org
[ 0.013] HTTP Upgrade request
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GET / HTTP/1.1
Host: nghttp2.org
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Connection: Upgrade, HTTP2-Settings
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Upgrade: h2c-14
HTTP2-Settings: AwAAAGQEAAD__wUAAAAB
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Accept: */*
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User-Agent: nghttp2/0.4.0-DEV
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[ 0.024] HTTP Upgrade response
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HTTP/1.1 101 Switching Protocols
Connection: Upgrade
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Upgrade: h2c-14
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[ 0.024] HTTP Upgrade success
[ 0.024] send SETTINGS frame <length=15, flags=0x00, stream_id=0>
(niv=3)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
[SETTINGS_COMPRESS_DATA(5):1]
[ 0.024] recv SETTINGS frame <length=10, flags=0x00, stream_id=0>
(niv=2)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
[ 0.024] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
; ACK
(niv=0)
[ 0.024] (stream_id=1, noind=0) :status: 200
[ 0.024] (stream_id=1, noind=0) accept-ranges: bytes
[ 0.024] (stream_id=1, noind=0) age: 10
[ 0.024] (stream_id=1, noind=0) content-length: 40243
[ 0.024] (stream_id=1, noind=0) content-type: text/html
[ 0.024] (stream_id=1, noind=0) date: Wed, 14 May 2014 15:16:34 GMT
[ 0.024] (stream_id=1, noind=0) etag: "535d0eea-9d33"
[ 0.024] (stream_id=1, noind=0) last-modified: Sun, 27 Apr 2014 14:06:34 GMT
[ 0.024] (stream_id=1, noind=0) server: nginx/1.4.6 (Ubuntu)
[ 0.024] (stream_id=1, noind=0) x-varnish: 2114900541 2114900540
[ 0.024] (stream_id=1, noind=0) via: 1.1 varnish, 1.1 nghttpx
[ 0.024] recv HEADERS frame <length=148, flags=0x04, stream_id=1>
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; END_HEADERS
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(padlen=0)
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; First response header
[ 0.024] recv DATA frame <length=3786, flags=0x00, stream_id=1>
[ 0.025] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.031] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.031] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.032] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.032] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.033] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.033] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.033] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=0>
(window_size_increment=33164)
[ 0.033] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=1>
(window_size_increment=33164)
[ 0.038] recv DATA frame <length=4096, flags=0x00, stream_id=1>
[ 0.038] recv DATA frame <length=3689, flags=0x00, stream_id=1>
[ 0.038] recv DATA frame <length=0, flags=0x01, stream_id=1>
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; END_STREAM
[ 0.038] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
(niv=0)
[ 0.038] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
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(last_stream_id=0, error_code=NO_ERROR(0), opaque_data(0)=[])
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Using the ``-s`` option, ``nghttp`` prints out some timing information for
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requests, sorted by completion time::
$ nghttp -nas https://nghttp2.org/
***** Statistics *****
Request timing:
complete: relative time from protocol handshake to stream close
request: relative time from protocol handshake to request
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transmission. If '*' is shown, this was pushed by server.
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process: time for request and response
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code: HTTP status code
size: number of bytes received as response body without
inflation.
URI: request URI
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sorted by 'complete'
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complete request process code size request path
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+11.07ms +120us 10.95ms 200 9K /
+16.77ms * +8.80ms 7.98ms 200 8K /stylesheets/screen.css
+27.00ms +11.16ms 15.84ms 200 3K /javascripts/octopress.js
+27.40ms +11.16ms 16.24ms 200 3K /javascripts/modernizr-2.0.js
+76.14ms +11.17ms 64.97ms 200 171K /images/posts/with-pri-blog.png
+88.52ms +11.17ms 77.36ms 200 174K /images/posts/without-pri-blog.png
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Using the ``-r`` option, ``nghttp`` writes more detailed timing data to
the given file in HAR format.
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nghttpd - server
++++++++++++++++
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``nghttpd`` is a multi-threaded static web server.
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By default, it uses SSL/TLS connection. Use ``--no-tls`` option to
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disable it.
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``nghttpd`` only accepts HTTP/2 connections via NPN/ALPN or direct
HTTP/2 connections. No HTTP Upgrade is supported.
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The ``-p`` option allows users to configure server push.
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Just like ``nghttp``, it has a verbose output mode for framing
information. Here is sample output from ``nghttpd``::
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$ nghttpd --no-tls -v 8080
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IPv4: listen on port 8080
IPv6: listen on port 8080
[id=1] [ 15.921] send SETTINGS frame <length=10, flags=0x00, stream_id=0>
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(niv=2)
[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
[SETTINGS_COMPRESS_DATA(5):1]
[id=1] [ 15.921] recv SETTINGS frame <length=15, flags=0x00, stream_id=0>
(niv=3)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
[SETTINGS_COMPRESS_DATA(5):1]
[id=1] [ 15.921] (stream_id=1, noind=0) :authority: localhost:8080
[id=1] [ 15.921] (stream_id=1, noind=0) :method: GET
[id=1] [ 15.921] (stream_id=1, noind=0) :path: /
[id=1] [ 15.921] (stream_id=1, noind=0) :scheme: http
[id=1] [ 15.921] (stream_id=1, noind=0) accept: */*
[id=1] [ 15.921] (stream_id=1, noind=0) accept-encoding: gzip, deflate
[id=1] [ 15.921] (stream_id=1, noind=0) user-agent: nghttp2/0.4.0-DEV
[id=1] [ 15.921] recv HEADERS frame <length=48, flags=0x05, stream_id=1>
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; END_STREAM | END_HEADERS
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(padlen=0)
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; Open new stream
[id=1] [ 15.921] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
(niv=0)
[id=1] [ 15.921] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
; ACK
(niv=0)
[id=1] [ 15.921] send HEADERS frame <length=82, flags=0x04, stream_id=1>
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; END_HEADERS
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(padlen=0)
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; First response header
:status: 200
cache-control: max-age=3600
content-length: 612
date: Wed, 14 May 2014 15:19:03 GMT
last-modified: Sat, 08 Mar 2014 16:04:06 GMT
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server: nghttpd nghttp2/0.4.0-DEV
[id=1] [ 15.922] send DATA frame <length=381, flags=0x20, stream_id=1>
; COMPRESSED
[id=1] [ 15.922] send DATA frame <length=0, flags=0x01, stream_id=1>
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; END_STREAM
[id=1] [ 15.922] stream_id=1 closed
[id=1] [ 15.922] recv GOAWAY frame <length=8, flags=0x00, stream_id=0>
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(last_stream_id=0, error_code=NO_ERROR(0), opaque_data(0)=[])
[id=1] [ 15.922] closed
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nghttpx - proxy
+++++++++++++++
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``nghttpx`` is a multi-threaded reverse proxy for ``h2-14``, SPDY and
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HTTP/1.1, and powers http://nghttp2.org and supports HTTP/2 server push.
It has several operational modes:
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================== ============================ ============== =============
Mode option Frontend Backend Note
================== ============================ ============== =============
default mode HTTP/2, SPDY, HTTP/1.1 (TLS) HTTP/1.1 Reverse proxy
``--http2-proxy`` HTTP/2, SPDY, HTTP/1.1 (TLS) HTTP/1.1 SPDY proxy
``--http2-bridge`` HTTP/2, SPDY, HTTP/1.1 (TLS) HTTP/2 (TLS)
``--client`` HTTP/2, HTTP/1.1 HTTP/2 (TLS)
``--client-proxy`` HTTP/2, HTTP/1.1 HTTP/2 (TLS) Forward proxy
================== ============================ ============== =============
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The interesting mode at the moment is the default mode. It works like
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a reverse proxy and listens for ``h2-14``, SPDY and HTTP/1.1 and can
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be deployed as a SSL/TLS terminator for existing web server.
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The default mode, ``--http2-proxy`` and ``--http2-bridge`` modes use
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SSL/TLS in the frontend connection by default. To disable SSL/TLS,
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use the ``--frontend-no-tls`` option. If that option is used, SPDY is
disabled in the frontend and incoming HTTP/1.1 connections can be
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upgraded to HTTP/2 through HTTP Upgrade.
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The ``--http2-bridge``, ``--client`` and ``--client-proxy`` modes use
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SSL/TLS in the backend connection by deafult. To disable SSL/TLS, use
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the ``--backend-no-tls`` option.
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``nghttpx`` supports a configuration file. See the ``--conf`` option and
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sample configuration file ``nghttpx.conf.sample``.
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In the default mode, (without any of ``--http2-proxy``,
``--http2-bridge``, ``--client-proxy`` and ``--client`` options),
``nghttpx`` works as reverse proxy to the backend server::
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Client <-- (HTTP/2, SPDY, HTTP/1.1) --> nghttpx <-- (HTTP/1.1) --> Web Server
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[reverse proxy]
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With the ``--http2-proxy`` option, it works as a so called secure proxy (aka
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SPDY proxy)::
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Client <-- (HTTP/2, SPDY, HTTP/1.1) --> nghttpx <-- (HTTP/1.1) --> Proxy
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[secure proxy] (e.g., Squid, ATS)
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The ``Client`` in the above example needs to be configured to use
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``nghttpx`` as secure proxy.
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At the time of this writing, Chrome is the only browser which supports
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secure proxy. One way to configure Chrome to use a secure proxy is
to create a proxy.pac script like this:
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.. code-block:: javascript
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function FindProxyForURL(url, host) {
return "HTTPS SERVERADDR:PORT";
}
``SERVERADDR`` and ``PORT`` is the hostname/address and port of the
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machine nghttpx is running on. Please note that Chrome requires a valid
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certificate for secure proxy.
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Then run Chrome with the following arguments::
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$ google-chrome --proxy-pac-url=file:///path/to/proxy.pac --use-npn
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With ``--http2-bridge``, it accepts HTTP/2, SPDY and HTTP/1.1
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connections and communicates with the backend in HTTP/2::
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Client <-- (HTTP/2, SPDY, HTTP/1.1) --> nghttpx <-- (HTTP/2) --> Web or HTTP/2 Proxy etc
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(e.g., nghttpx -s)
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With ``--client-proxy``, it works as a forward proxy and expects
that the backend is an HTTP/2 proxy::
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Client <-- (HTTP/2, HTTP/1.1) --> nghttpx <-- (HTTP/2) --> HTTP/2 Proxy
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[forward proxy] (e.g., nghttpx -s)
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The ``Client`` needs to be configured to use nghttpx as a forward
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proxy. The frontend HTTP/1.1 connection can be upgraded to HTTP/2
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through HTTP Upgrade. With the above configuration, one can use
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HTTP/1.1 client to access and test their HTTP/2 servers.
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With ``--client``, it works as a reverse proxy and expects that
the backend is an HTTP/2 Web server::
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Client <-- (HTTP/2, HTTP/1.1) --> nghttpx <-- (HTTP/2) --> Web Server
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[reverse proxy]
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The frontend HTTP/1.1 connection can be upgraded to HTTP/2
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through HTTP Upgrade.
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For the operation modes which talk to the backend in HTTP/2 over
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SSL/TLS, the backend connections can be tunneled through an HTTP proxy.
The proxy is specified using ``--backend-http-proxy-uri``. The
following figure illustrates the example of the ``--http2-bridge`` and
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``--backend-http-proxy-uri`` options to talk to the outside HTTP/2
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proxy through an HTTP proxy::
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Client <-- (HTTP/2, SPDY, HTTP/1.1) --> nghttpx <-- (HTTP/2) --
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2014-03-30 12:09:21 +02:00
--===================---> HTTP/2 Proxy
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(HTTP proxy tunnel) (e.g., nghttpx -s)
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2014-03-02 15:44:43 +01:00
Benchmarking tool
-----------------
The ``h2load`` program is a benchmarking tool for HTTP/2 and SPDY.
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The SPDY support is enabled if the program was built with the spdylay
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library. The UI of ``h2load`` is heavily inspired by ``weighttp``
(https://github.com/lighttpd/weighttp). The typical usage is as
follows::
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$ h2load -n100000 -c100 -m100 https://localhost:8443/
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starting benchmark...
spawning thread #0: 100 concurrent clients, 100000 total requests
Protocol: TLSv1.2
Cipher: ECDHE-RSA-AES128-GCM-SHA256
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progress: 10% done
progress: 20% done
progress: 30% done
progress: 40% done
progress: 50% done
progress: 60% done
progress: 70% done
progress: 80% done
progress: 90% done
progress: 100% done
finished in 7.10s, 14092 req/s, 55.67MB/s
requests: 100000 total, 100000 started, 100000 done, 100000 succeeded, 0 failed, 0 errored
status codes: 100000 2xx, 0 3xx, 0 4xx, 0 5xx
traffic: 414200800 bytes total, 2723100 bytes headers, 409600000 bytes data
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min max mean sd +/- sd
time for request: 283.86ms 1.46s 659.70ms 150.87ms 84.68%
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The above example issued total 100,000 requests, using 100 concurrent
clients (in other words, 100 HTTP/2 sessions), and a maximum of 100 streams
per client. With the ``-t`` option, ``h2load`` will use multiple native
threads to avoid saturating a single core on client side.
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.. warning::
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**Don't use this tool against publicly available servers.** That is
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considered a DOS attack. Please only use it against your private
servers.
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2014-01-10 13:53:48 +01:00
HPACK tools
-----------
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The ``src`` directory contains the HPACK tools. The ``deflatehd`` program is a
command-line header compression tool. The ``inflatehd`` program is a
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command-line header decompression tool. Both tools read input from
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stdin and write output to stdout. Errors are written to stderr.
They take JSON as input and output. We (mostly) use the same JSON data
format described at https://github.com/http2jp/hpack-test-case.
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deflatehd - header compressor
+++++++++++++++++++++++++++++
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The ``deflatehd`` program reads JSON data or HTTP/1-style header fields from
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stdin and outputs compressed header block in JSON.
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For the JSON input, the root JSON object must include a ``cases`` key.
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Its value has to include the sequence of input header set. They share
the same compression context and are processed in the order they
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appear. Each item in the sequence is a JSON object and it must
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include a ``headers`` key. Its value is an array of JSON objects,
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which includes exactly one name/value pair.
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2014-01-11 09:13:24 +01:00
Example:
.. code-block:: json
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{
"cases":
[
{
"headers": [
{ ":method": "GET" },
{ ":path": "/" }
]
},
{
"headers": [
{ ":method": "POST" },
{ ":path": "/" }
]
}
]
}
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With the ``-t`` option, the program can accept more familiar HTTP/1 style
header field blocks. Each header set is delimited by an empty line:
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Example::
:method: GET
:scheme: https
:path: /
:method: POST
user-agent: nghttp2
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The output is in JSON object. It should include a ``cases`` key and its
value is an array of JSON objects, which has at least the following keys:
2013-10-28 16:22:18 +01:00
seq
The index of header set in the input.
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input_length
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The sum of the length of the name/value pairs in the input.
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output_length
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The length of the compressed header block.
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percentage_of_original_size
``input_length`` / ``output_length`` * 100
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wire
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The compressed header block as a hex string.
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2014-01-11 09:06:26 +01:00
headers
The input header set.
header_table_size
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The header table size adjusted before deflating the header set.
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2014-01-11 09:13:24 +01:00
Examples:
.. code-block:: json
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{
"cases":
[
{
"seq": 0,
"input_length": 66,
"output_length": 20,
"percentage_of_original_size": 30.303030303030305,
"wire": "01881f3468e5891afcbf83868a3d856659c62e3f",
"headers": [
{
":authority": "example.org"
},
{
":method": "GET"
},
{
":path": "/"
},
{
":scheme": "https"
},
{
"user-agent": "nghttp2"
}
],
"header_table_size": 4096
}
,
{
"seq": 1,
"input_length": 74,
"output_length": 10,
"percentage_of_original_size": 13.513513513513514,
"wire": "88448504252dd5918485",
"headers": [
{
":authority": "example.org"
},
{
":method": "POST"
},
{
":path": "/account"
},
{
":scheme": "https"
},
{
"user-agent": "nghttp2"
}
],
"header_table_size": 4096
}
]
}
The output can be used as the input for ``inflatehd`` and
``deflatehd``.
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With the ``-d`` option, the extra ``header_table`` key is added and its
associated value includes the state of dynamic header table after the
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corresponding header set was processed. The value includes at least
the following keys:
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entries
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The entry in the header table. If ``referenced`` is ``true``, it
is in the reference set. The ``size`` includes the overhead (32
bytes). The ``index`` corresponds to the index of header table.
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The ``name`` is the header field name and the ``value`` is the
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header field value.
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size
The sum of the spaces entries occupied, this includes the
entry overhead.
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max_size
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The maximum header table size.
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deflate_size
The sum of the spaces entries occupied within
``max_deflate_size``.
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2014-01-11 09:06:26 +01:00
max_deflate_size
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The maximum header table size the encoder uses. This can be smaller
than ``max_size``. In this case, the encoder only uses up to first
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``max_deflate_size`` buffer. Since the header table size is still
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``max_size``, the encoder has to keep track of entries ouside the
``max_deflate_size`` but inside the ``max_size`` and make sure
that they are no longer referenced.
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2014-01-11 09:13:24 +01:00
Example:
.. code-block:: json
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{
"cases":
[
{
"seq": 0,
"input_length": 66,
"output_length": 20,
"percentage_of_original_size": 30.303030303030305,
"wire": "01881f3468e5891afcbf83868a3d856659c62e3f",
"headers": [
{
":authority": "example.org"
},
{
":method": "GET"
},
{
":path": "/"
},
{
":scheme": "https"
},
{
"user-agent": "nghttp2"
}
],
"header_table_size": 4096,
"header_table": {
"entries": [
{
"index": 1,
"name": "user-agent",
"value": "nghttp2",
"referenced": true,
"size": 49
},
{
"index": 2,
"name": ":scheme",
"value": "https",
"referenced": true,
"size": 44
},
{
"index": 3,
"name": ":path",
"value": "/",
"referenced": true,
"size": 38
},
{
"index": 4,
"name": ":method",
"value": "GET",
"referenced": true,
"size": 42
},
{
"index": 5,
"name": ":authority",
"value": "example.org",
"referenced": true,
"size": 53
}
],
"size": 226,
"max_size": 4096,
"deflate_size": 226,
"max_deflate_size": 4096
}
}
,
{
"seq": 1,
"input_length": 74,
"output_length": 10,
"percentage_of_original_size": 13.513513513513514,
"wire": "88448504252dd5918485",
"headers": [
{
":authority": "example.org"
},
{
":method": "POST"
},
{
":path": "/account"
},
{
":scheme": "https"
},
{
"user-agent": "nghttp2"
}
],
"header_table_size": 4096,
"header_table": {
"entries": [
{
"index": 1,
"name": ":method",
"value": "POST",
"referenced": true,
"size": 43
},
{
"index": 2,
"name": "user-agent",
"value": "nghttp2",
"referenced": true,
"size": 49
},
{
"index": 3,
"name": ":scheme",
"value": "https",
"referenced": true,
"size": 44
},
{
"index": 4,
"name": ":path",
"value": "/",
"referenced": false,
"size": 38
},
{
"index": 5,
"name": ":method",
"value": "GET",
"referenced": false,
"size": 42
},
{
"index": 6,
"name": ":authority",
"value": "example.org",
"referenced": true,
"size": 53
}
],
"size": 269,
"max_size": 4096,
"deflate_size": 269,
"max_deflate_size": 4096
}
}
]
}
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inflatehd - header decompressor
+++++++++++++++++++++++++++++++
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The ``inflatehd`` program reads JSON data from stdin and outputs decompressed
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name/value pairs in JSON.
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2015-03-16 07:42:19 +01:00
The root JSON object must include the ``cases`` key. Its value has to
include the sequence of compressed header blocks. They share the same
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compression context and are processed in the order they appear. Each
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item in the sequence is a JSON object and it must have at least a
``wire`` key. Its value is a compressed header block as a hex string.
2013-10-28 16:22:18 +01:00
2014-01-11 09:13:24 +01:00
Example:
.. code-block:: json
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2014-01-11 09:06:26 +01:00
{
"cases":
[
{ "wire": "8285" },
{ "wire": "8583" }
]
}
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2015-03-16 07:42:19 +01:00
The output is a JSON object. It should include a ``cases`` key and its
value is an array of JSON objects, which has at least following keys:
2013-10-28 16:22:18 +01:00
seq
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The index of the header set in the input.
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headers
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A JSON array that includes decompressed name/value pairs.
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wire
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The compressed header block as a hex string.
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header_table_size
The header table size adjusted before inflating compressed header
2014-01-11 09:06:26 +01:00
block.
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2014-01-11 09:13:24 +01:00
Example:
.. code-block:: json
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2014-01-11 09:06:26 +01:00
{
"cases":
[
{
"seq": 0,
"wire": "01881f3468e5891afcbf83868a3d856659c62e3f",
"headers": [
{
":authority": "example.org"
},
{
":method": "GET"
},
{
":path": "/"
},
{
":scheme": "https"
},
{
"user-agent": "nghttp2"
}
],
"header_table_size": 4096
}
,
{
"seq": 1,
"wire": "88448504252dd5918485",
"headers": [
{
":method": "POST"
},
{
":path": "/account"
},
{
"user-agent": "nghttp2"
},
{
":scheme": "https"
},
{
":authority": "example.org"
}
],
"header_table_size": 4096
}
]
}
The output can be used as the input for ``deflatehd`` and
``inflatehd``.
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With the ``-d`` option, the extra ``header_table`` key is added and its
associated value includes the state of the dynamic header table after the
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corresponding header set was processed. The format is the same as
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``deflatehd``.
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libnghttp2_asio: High level HTTP/2 C++ library
----------------------------------------------
libnghttp2_asio is C++ library built on top of libnghttp2 and provides
high level abstraction API to build HTTP/2 applications. It depends
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on the Boost::ASIO library and OpenSSL. Currently libnghttp2_asio
provides both client and server APIs.
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libnghttp2_asio is not built by default. Use the ``--enable-asio-lib``
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configure flag to build libnghttp2_asio. The required Boost libraries
are:
* Boost::Asio
* Boost::System
* Boost::Thread
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The server API is designed to build an HTTP/2 server very easily to utilize
C++11 anonymous functions and closures. The bare minimum example of
an HTTP/2 server looks like this:
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.. code-block:: cpp
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#include <nghttp2/asio_http2_server.h>
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using namespace nghttp2::asio_http2;
using namespace nghttp2::asio_http2::server;
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int main(int argc, char *argv[]) {
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boost::system::error_code ec;
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http2 server;
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server.handle("/", [](const request &req, const response &res) {
res.write_head(200);
res.end("hello, world\n");
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});
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if (server.listen_and_serve(ec, "localhost", "3000")) {
std::cerr << "error: " << ec.message() << std::endl;
}
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}
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Here is sample code to use the client API:
.. code-block:: cpp
#include <iostream>
#include <nghttp2/asio_http2_client.h>
using boost::asio::ip::tcp;
using namespace nghttp2::asio_http2;
using namespace nghttp2::asio_http2::client;
int main(int argc, char *argv[]) {
boost::system::error_code ec;
boost::asio::io_service io_service;
// connect to localhost:3000
session sess(io_service, "localhost", "3000");
sess.on_connect([&sess](tcp::resolver::iterator endpoint_it) {
boost::system::error_code ec;
auto req = sess.submit(ec, "GET", "http://localhost:3000/");
req->on_response([](const response &res) {
// print status code and response header fields.
std::cerr << "HTTP/2 " << res.status_code() << std::endl;
for (auto &kv : res.header()) {
std::cerr << kv.first << ": " << kv.second.value << "\n";
}
std::cerr << std::endl;
res.on_data([](const uint8_t *data, std::size_t len) {
std::cerr.write(reinterpret_cast<const char *>(data), len);
std::cerr << std::endl;
});
});
req->on_close([&sess](uint32_t error_code) {
// shutdown session after first request was done.
sess.shutdown();
});
});
sess.on_error([](const boost::system::error_code &ec) {
std::cerr << "error: " << ec.message() << std::endl;
});
io_service.run();
}
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For more details, see the documentation of libnghttp2_asio.
Python bindings
---------------
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The ``python`` directory contains nghttp2 Python bindings. The
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bindings currently provide HPACK compressor and decompressor classes
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and an HTTP/2 server.
The extension module is called ``nghttp2``.
``make`` will build the bindings and target Python version is
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determined by the ``configure`` script. If the detected Python version is not
what you expect, specify a path to Python executable in a ``PYTHON``
variable as an argument to configure script (e.g., ``./configure
PYTHON=/usr/bin/python3.4``).
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The following example code illustrates basic usage of the HPACK compressor
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and decompressor in Python:
.. code-block:: python
import binascii
import nghttp2
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deflater = nghttp2.HDDeflater()
inflater = nghttp2.HDInflater()
data = deflater.deflate([(b'foo', b'bar'),
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(b'baz', b'buz')])
print(binascii.b2a_hex(data))
hdrs = inflater.inflate(data)
print(hdrs)
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The ``nghttp2.HTTP2Server`` class builds on top of the asyncio event
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loop. On construction, *RequestHandlerClass* must be given, which
must be a subclass of ``nghttp2.BaseRequestHandler`` class.
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The ``BaseRequestHandler`` class is used to handle the HTTP/2 stream.
By default, it does nothing. It must be subclassed to handle each
event callback method.
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The first callback method invoked is ``on_headers()``. It is called
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when HEADERS frame, which includes the request header fields, has arrived.
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If the request has a request body, ``on_data(data)`` is invoked for each
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chunk of received data.
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Once the entire request is received, ``on_request_done()`` is invoked.
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When the stream is closed, ``on_close(error_code)`` is called.
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The application can send a response using ``send_response()`` method.
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It can be used in ``on_headers()``, ``on_data()`` or
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``on_request_done()``.
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The application can push resources using the ``push()`` method. It must be
used before the ``send_response()`` call.
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The following instance variables are available:
client_address
Contains a tuple of the form (host, port) referring to the
client's address.
stream_id
Stream ID of this stream.
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scheme
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Scheme of the request URI. This is a value of :scheme header
field.
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method
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Method of this stream. This is a value of :method header field.
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host
This is a value of :authority or host header field.
path
This is a value of :path header field.
The following example illustrates the HTTP2Server and
BaseRequestHandler usage:
.. code-block:: python
#!/usr/bin/env python
import io, ssl
import nghttp2
class Handler(nghttp2.BaseRequestHandler):
def on_headers(self):
self.push(path='/css/bootstrap.css',
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request_headers = [('content-length', '3')],
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status=200,
body='foo')
self.push(path='/js/bootstrap.js',
method='GET',
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request_headers = [('content-length', '10')],
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status=200,
body='foobarbuzz')
self.send_response(status=200,
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headers = [('content-type', 'text/plain')],
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body=io.BytesIO(b'nghttp2-python FTW'))
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
ctx.options = ssl.OP_ALL | ssl.OP_NO_SSLv2
ctx.load_cert_chain('server.crt', 'server.key')
# give None to ssl to make the server non-SSL/TLS
server = nghttp2.HTTP2Server(('127.0.0.1', 8443), Handler, ssl=ctx)
server.serve_forever()
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Contribution
------------
[This text was composed based on 1.2. License section of curl/libcurl
project.]
When contributing with code, you agree to put your changes and new
code under the same license nghttp2 is already using unless stated and
agreed otherwise.
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When changing existing source code, do not alter the copyright of
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the original file(s). The copyright will still be owned by the
original creator(s) or those who have been assigned copyright by the
original author(s).
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By submitting a patch to the nghttp2 project, you (or your employer, as
the case may be) agree to assign the copyright of your submission to us.
.. the above really needs to be reworded to pass legal muster.
We will credit you for your
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changes as far as possible, to give credit but also to keep a trace
back to who made what changes. Please always provide us with your
full real name when contributing!
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See `Contribution Guidelines
<https://nghttp2.org/documentation/contribute.html>`_ for more
details.