1271 lines
40 KiB
ReStructuredText
1271 lines
40 KiB
ReStructuredText
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
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library. On top of that, we have implemented an HTTP/2 client, server
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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
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code coverage yet.
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Development Status
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------------------
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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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=========================== =======
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HTTP/2 Features Support
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=========================== =======
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Core frames handling Yes
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Dependency Tree Yes
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Large header (CONTINUATION) Yes
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=========================== =======
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Public Test Server
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------------------
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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``
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and ``http/1.1`` via ALPN/NPN and requires TLSv1.2 for HTTP/2
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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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------------
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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:
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* cunit >= 2.1
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To build the documentation, you need to install:
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* 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:
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* 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
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(``nghttpd`` and ``nghttpx``), jemalloc is recommended:
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* jemalloc
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libnghttp2_asio C++ library requires the following packages:
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* libboost-dev >= 1.54.0
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* libboost-thread-dev >= 1.54.0
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The Python bindings require the following packages:
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* cython >= 0.19
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* 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 \
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zlib1g-dev libcunit1-dev libssl-dev libxml2-dev libev-dev libevent-dev libjansson-dev \
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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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-----------------
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Building from git is easy, but please be sure that at least autoconf 2.68 is
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used::
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$ autoreconf -i
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$ automake
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$ autoconf
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$ ./configure
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$ 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
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disable multi-threading in nghttpd, nghttpx and h2load to prevent
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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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Notes for building on Windows (Mingw/Cygwin)
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-------------------------------------------
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Under Mingw environment, you can only complie the library, it's `libnghttp2-X.dll` and `libnghttp2.a`.
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If you want to compile the applications(`h2load`, `nghttp`, `nghttpx`, `nghttpd`), you need to use the Cygwin environment.
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Under Cygwin environment, to compile the applications you need to compile and install the `libev` first.
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and second, you need to undefine the macro \_\_STRICT\_ANSI\_\_, if you not, the functions `fdopen`, `fileno` and `strptime` will not available.
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the simple command like this::
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export CFLAGS="-U__STRICT_ANSI__ -I$libev_PREFIX/include -L$libev_PREFIX/lib"
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export CXXFLAGS=$CFLAGS
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make
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If you want to compile the applications under `examples/`, you need to remove or rename the `event.h` from libev's installation, because it conflicts with libevent's installation.
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Building the documentation
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--------------------------
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.. note::
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Documentation is still incomplete.
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To build the documentation, run::
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$ make html
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The documents will be generated under ``doc/manual/html/``.
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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
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----------
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Unit tests are done by simply running `make check`.
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Integration tests
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-----------------
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We have the integration tests for the nghttpx proxy server. The tests are
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written in the `Go programming language <http://golang.org/>`_ and uses
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its testing framework. We depend on the following libraries:
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* https://github.com/bradfitz/http2
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* 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
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following command under ``integration-tests`` directory::
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$ make itprep
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To run the tests, run the following command under
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``integration-tests`` directory::
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$ 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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---------------------------------
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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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+++++++++++++++
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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
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[ 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
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[ 0.068] send SETTINGS frame <length=15, flags=0x00, stream_id=0>
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(niv=3)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
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[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
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[SETTINGS_COMPRESS_DATA(5):1]
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[ 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
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:authority: nghttp2.org
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:method: GET
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:path: /
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:scheme: https
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accept: */*
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accept-encoding: gzip, deflate
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user-agent: nghttp2/0.4.0-DEV
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[ 0.068] recv SETTINGS frame <length=10, flags=0x00, stream_id=0>
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(niv=2)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
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[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
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[ 0.068] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
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(niv=0)
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[ 0.079] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
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(niv=0)
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[ 0.080] (stream_id=1, noind=0) :status: 200
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[ 0.080] (stream_id=1, noind=0) accept-ranges: bytes
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[ 0.080] (stream_id=1, noind=0) age: 15
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[ 0.080] (stream_id=1, noind=0) content-length: 40243
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[ 0.080] (stream_id=1, noind=0) content-type: text/html
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[ 0.080] (stream_id=1, noind=0) date: Wed, 14 May 2014 15:14:30 GMT
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[ 0.080] (stream_id=1, noind=0) etag: "535d0eea-9d33"
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[ 0.080] (stream_id=1, noind=0) last-modified: Sun, 27 Apr 2014 14:06:34 GMT
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[ 0.080] (stream_id=1, noind=0) server: nginx/1.4.6 (Ubuntu)
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[ 0.080] (stream_id=1, noind=0) x-varnish: 2114900538 2114900537
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[ 0.080] (stream_id=1, noind=0) via: 1.1 varnish, 1.1 nghttpx
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[ 0.080] (stream_id=1, noind=0) strict-transport-security: max-age=31536000
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[ 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
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[ 0.080] recv DATA frame <length=3786, flags=0x00, stream_id=1>
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[ 0.080] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.081] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.093] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.093] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.094] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.094] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.094] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.096] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.096] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=0>
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(window_size_increment=36554)
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[ 0.096] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=1>
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(window_size_increment=36554)
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[ 0.108] recv DATA frame <length=3689, flags=0x00, stream_id=1>
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[ 0.108] recv DATA frame <length=0, flags=0x01, stream_id=1>
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; END_STREAM
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[ 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
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[ 0.013] HTTP Upgrade request
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GET / HTTP/1.1
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Host: nghttp2.org
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Connection: Upgrade, HTTP2-Settings
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Upgrade: h2c-14
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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
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Connection: Upgrade
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Upgrade: h2c-14
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[ 0.024] HTTP Upgrade success
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[ 0.024] send SETTINGS frame <length=15, flags=0x00, stream_id=0>
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(niv=3)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
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[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
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[SETTINGS_COMPRESS_DATA(5):1]
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[ 0.024] recv SETTINGS frame <length=10, flags=0x00, stream_id=0>
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(niv=2)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
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[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
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[ 0.024] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
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(niv=0)
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[ 0.024] (stream_id=1, noind=0) :status: 200
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[ 0.024] (stream_id=1, noind=0) accept-ranges: bytes
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[ 0.024] (stream_id=1, noind=0) age: 10
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[ 0.024] (stream_id=1, noind=0) content-length: 40243
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[ 0.024] (stream_id=1, noind=0) content-type: text/html
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[ 0.024] (stream_id=1, noind=0) date: Wed, 14 May 2014 15:16:34 GMT
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[ 0.024] (stream_id=1, noind=0) etag: "535d0eea-9d33"
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[ 0.024] (stream_id=1, noind=0) last-modified: Sun, 27 Apr 2014 14:06:34 GMT
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[ 0.024] (stream_id=1, noind=0) server: nginx/1.4.6 (Ubuntu)
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[ 0.024] (stream_id=1, noind=0) x-varnish: 2114900541 2114900540
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[ 0.024] (stream_id=1, noind=0) via: 1.1 varnish, 1.1 nghttpx
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[ 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
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[ 0.024] recv DATA frame <length=3786, flags=0x00, stream_id=1>
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[ 0.025] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.031] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.031] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.032] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.032] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.033] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.033] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.033] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=0>
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(window_size_increment=33164)
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[ 0.033] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=1>
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(window_size_increment=33164)
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[ 0.038] recv DATA frame <length=4096, flags=0x00, stream_id=1>
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[ 0.038] recv DATA frame <length=3689, flags=0x00, stream_id=1>
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[ 0.038] recv DATA frame <length=0, flags=0x01, stream_id=1>
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; END_STREAM
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[ 0.038] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
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(niv=0)
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[ 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::
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$ nghttp -nas https://nghttp2.org/
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***** Statistics *****
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Request timing:
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complete: relative time from protocol handshake to stream close
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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
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size: number of bytes received as response body without
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inflation.
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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 /
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+16.77ms * +8.80ms 7.98ms 200 8K /stylesheets/screen.css
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+27.00ms +11.16ms 15.84ms 200 3K /javascripts/octopress.js
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+27.40ms +11.16ms 16.24ms 200 3K /javascripts/modernizr-2.0.js
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+76.14ms +11.17ms 64.97ms 200 171K /images/posts/with-pri-blog.png
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+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
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the given file in HAR format.
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nghttpd - server
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++++++++++++++++
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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
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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
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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
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IPv6: listen on port 8080
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[id=1] [ 15.921] send SETTINGS frame <length=10, flags=0x00, stream_id=0>
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(niv=2)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
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[SETTINGS_COMPRESS_DATA(5):1]
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[id=1] [ 15.921] recv SETTINGS frame <length=15, flags=0x00, stream_id=0>
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(niv=3)
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[SETTINGS_MAX_CONCURRENT_STREAMS(3):100]
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[SETTINGS_INITIAL_WINDOW_SIZE(4):65535]
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[SETTINGS_COMPRESS_DATA(5):1]
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[id=1] [ 15.921] (stream_id=1, noind=0) :authority: localhost:8080
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[id=1] [ 15.921] (stream_id=1, noind=0) :method: GET
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[id=1] [ 15.921] (stream_id=1, noind=0) :path: /
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[id=1] [ 15.921] (stream_id=1, noind=0) :scheme: http
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[id=1] [ 15.921] (stream_id=1, noind=0) accept: */*
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[id=1] [ 15.921] (stream_id=1, noind=0) accept-encoding: gzip, deflate
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[id=1] [ 15.921] (stream_id=1, noind=0) user-agent: nghttp2/0.4.0-DEV
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[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
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[id=1] [ 15.921] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
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(niv=0)
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[id=1] [ 15.921] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
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; ACK
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(niv=0)
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[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
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:status: 200
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cache-control: max-age=3600
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content-length: 612
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date: Wed, 14 May 2014 15:19:03 GMT
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last-modified: Sat, 08 Mar 2014 16:04:06 GMT
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server: nghttpd nghttp2/0.4.0-DEV
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[id=1] [ 15.922] send DATA frame <length=381, flags=0x20, stream_id=1>
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; COMPRESSED
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[id=1] [ 15.922] send DATA frame <length=0, flags=0x01, stream_id=1>
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; END_STREAM
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[id=1] [ 15.922] stream_id=1 closed
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[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)=[])
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[id=1] [ 15.922] closed
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nghttpx - proxy
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+++++++++++++++
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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.
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It has several operational modes:
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================== ============================ ============== =============
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Mode option Frontend Backend Note
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================== ============================ ============== =============
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default mode HTTP/2, SPDY, HTTP/1.1 (TLS) HTTP/1.1 Reverse proxy
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``--http2-proxy`` HTTP/2, SPDY, HTTP/1.1 (TLS) HTTP/1.1 SPDY proxy
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``--http2-bridge`` HTTP/2, SPDY, HTTP/1.1 (TLS) HTTP/2 (TLS)
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``--client`` HTTP/2, HTTP/1.1 HTTP/2 (TLS)
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``--client-proxy`` HTTP/2, HTTP/1.1 HTTP/2 (TLS) Forward proxy
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================== ============================ ============== =============
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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
|
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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``,
|
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``--http2-bridge``, ``--client-proxy`` and ``--client`` options),
|
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``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
|
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to create a proxy.pac script like this:
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.. code-block:: javascript
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function FindProxyForURL(url, host) {
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return "HTTPS SERVERADDR:PORT";
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}
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``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
|
|
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
|
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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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|
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The ``Client`` needs to be configured to use nghttpx as a forward
|
|
proxy. The frontend HTTP/1.1 connection can be upgraded to HTTP/2
|
|
through HTTP Upgrade. With the above configuration, one can use
|
|
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
|
|
[reverse proxy]
|
|
|
|
The frontend HTTP/1.1 connection can be upgraded to HTTP/2
|
|
through HTTP Upgrade.
|
|
|
|
For the operation modes which talk to the backend in HTTP/2 over
|
|
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
|
|
``--backend-http-proxy-uri`` options to talk to the outside HTTP/2
|
|
proxy through an HTTP proxy::
|
|
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|
Client <-- (HTTP/2, SPDY, HTTP/1.1) --> nghttpx <-- (HTTP/2) --
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|
|
--===================---> HTTP/2 Proxy
|
|
(HTTP proxy tunnel) (e.g., nghttpx -s)
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|
|
Benchmarking tool
|
|
-----------------
|
|
|
|
The ``h2load`` program is a benchmarking tool for HTTP/2 and SPDY.
|
|
The SPDY support is enabled if the program was built with the spdylay
|
|
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
|
|
progress: 10% done
|
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progress: 20% done
|
|
progress: 30% done
|
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progress: 40% done
|
|
progress: 50% done
|
|
progress: 60% done
|
|
progress: 70% done
|
|
progress: 80% done
|
|
progress: 90% done
|
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progress: 100% done
|
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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
|
|
min max mean sd +/- sd
|
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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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|
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|
**Don't use this tool against publicly available servers.** That is
|
|
considered a DOS attack. Please only use it against your private
|
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servers.
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HPACK tools
|
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-----------
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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
|
|
command-line header decompression tool. Both tools read input from
|
|
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
|
|
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.
|
|
Its value has to include the sequence of input header set. They share
|
|
the same compression context and are processed in the order they
|
|
appear. Each item in the sequence is a JSON object and it must
|
|
include a ``headers`` key. Its value is an array of JSON objects,
|
|
which includes exactly one name/value pair.
|
|
|
|
Example:
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"cases":
|
|
[
|
|
{
|
|
"headers": [
|
|
{ ":method": "GET" },
|
|
{ ":path": "/" }
|
|
]
|
|
},
|
|
{
|
|
"headers": [
|
|
{ ":method": "POST" },
|
|
{ ":path": "/" }
|
|
]
|
|
}
|
|
]
|
|
}
|
|
|
|
|
|
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::
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:method: GET
|
|
:scheme: https
|
|
:path: /
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|
|
:method: POST
|
|
user-agent: nghttp2
|
|
|
|
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:
|
|
|
|
seq
|
|
The index of header set in the input.
|
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|
|
input_length
|
|
The sum of the length of the name/value pairs in the input.
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|
|
output_length
|
|
The length of the compressed header block.
|
|
|
|
percentage_of_original_size
|
|
``input_length`` / ``output_length`` * 100
|
|
|
|
wire
|
|
The compressed header block as a hex string.
|
|
|
|
headers
|
|
The input header set.
|
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|
|
header_table_size
|
|
The header table size adjusted before deflating the header set.
|
|
|
|
Examples:
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"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``.
|
|
|
|
With the ``-d`` option, the extra ``header_table`` key is added and its
|
|
associated value includes the state of dynamic header table after the
|
|
corresponding header set was processed. The value includes at least
|
|
the following keys:
|
|
|
|
entries
|
|
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.
|
|
The ``name`` is the header field name and the ``value`` is the
|
|
header field value.
|
|
|
|
size
|
|
The sum of the spaces entries occupied, this includes the
|
|
entry overhead.
|
|
|
|
max_size
|
|
The maximum header table size.
|
|
|
|
deflate_size
|
|
The sum of the spaces entries occupied within
|
|
``max_deflate_size``.
|
|
|
|
max_deflate_size
|
|
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
|
|
``max_deflate_size`` buffer. Since the header table size is still
|
|
``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.
|
|
|
|
Example:
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"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
|
|
}
|
|
}
|
|
]
|
|
}
|
|
|
|
inflatehd - header decompressor
|
|
+++++++++++++++++++++++++++++++
|
|
|
|
The ``inflatehd`` program reads JSON data from stdin and outputs decompressed
|
|
name/value pairs in JSON.
|
|
|
|
The root JSON object must include the ``cases`` key. Its value has to
|
|
include the sequence of compressed header blocks. They share the same
|
|
compression context and are processed in the order they appear. Each
|
|
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.
|
|
|
|
Example:
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"cases":
|
|
[
|
|
{ "wire": "8285" },
|
|
{ "wire": "8583" }
|
|
]
|
|
}
|
|
|
|
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:
|
|
|
|
seq
|
|
The index of the header set in the input.
|
|
|
|
headers
|
|
A JSON array that includes decompressed name/value pairs.
|
|
|
|
wire
|
|
The compressed header block as a hex string.
|
|
|
|
header_table_size
|
|
The header table size adjusted before inflating compressed header
|
|
block.
|
|
|
|
Example:
|
|
|
|
.. code-block:: json
|
|
|
|
{
|
|
"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``.
|
|
|
|
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
|
|
corresponding header set was processed. The format is the same as
|
|
``deflatehd``.
|
|
|
|
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
|
|
on the Boost::ASIO library and OpenSSL. Currently libnghttp2_asio
|
|
provides both client and server APIs.
|
|
|
|
libnghttp2_asio is not built by default. Use the ``--enable-asio-lib``
|
|
configure flag to build libnghttp2_asio. The required Boost libraries
|
|
are:
|
|
|
|
* Boost::Asio
|
|
* Boost::System
|
|
* Boost::Thread
|
|
|
|
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:
|
|
|
|
.. code-block:: cpp
|
|
|
|
#include <nghttp2/asio_http2_server.h>
|
|
|
|
using namespace nghttp2::asio_http2;
|
|
using namespace nghttp2::asio_http2::server;
|
|
|
|
int main(int argc, char *argv[]) {
|
|
boost::system::error_code ec;
|
|
http2 server;
|
|
|
|
server.handle("/", [](const request &req, const response &res) {
|
|
res.write_head(200);
|
|
res.end("hello, world\n");
|
|
});
|
|
|
|
if (server.listen_and_serve(ec, "localhost", "3000")) {
|
|
std::cerr << "error: " << ec.message() << std::endl;
|
|
}
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
For more details, see the documentation of libnghttp2_asio.
|
|
|
|
Python bindings
|
|
---------------
|
|
|
|
The ``python`` directory contains nghttp2 Python bindings. The
|
|
bindings currently provide HPACK compressor and decompressor classes
|
|
and an HTTP/2 server.
|
|
|
|
The extension module is called ``nghttp2``.
|
|
|
|
``make`` will build the bindings and target Python version is
|
|
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``).
|
|
|
|
The following example code illustrates basic usage of the HPACK compressor
|
|
and decompressor in Python:
|
|
|
|
.. code-block:: python
|
|
|
|
import binascii
|
|
import nghttp2
|
|
|
|
deflater = nghttp2.HDDeflater()
|
|
inflater = nghttp2.HDInflater()
|
|
|
|
data = deflater.deflate([(b'foo', b'bar'),
|
|
(b'baz', b'buz')])
|
|
print(binascii.b2a_hex(data))
|
|
|
|
hdrs = inflater.inflate(data)
|
|
print(hdrs)
|
|
|
|
The ``nghttp2.HTTP2Server`` class builds on top of the asyncio event
|
|
loop. On construction, *RequestHandlerClass* must be given, which
|
|
must be a subclass of ``nghttp2.BaseRequestHandler`` class.
|
|
|
|
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.
|
|
|
|
The first callback method invoked is ``on_headers()``. It is called
|
|
when HEADERS frame, which includes the request header fields, has arrived.
|
|
|
|
If the request has a request body, ``on_data(data)`` is invoked for each
|
|
chunk of received data.
|
|
|
|
Once the entire request is received, ``on_request_done()`` is invoked.
|
|
|
|
When the stream is closed, ``on_close(error_code)`` is called.
|
|
|
|
The application can send a response using ``send_response()`` method.
|
|
It can be used in ``on_headers()``, ``on_data()`` or
|
|
``on_request_done()``.
|
|
|
|
The application can push resources using the ``push()`` method. It must be
|
|
used before the ``send_response()`` call.
|
|
|
|
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.
|
|
|
|
scheme
|
|
Scheme of the request URI. This is a value of :scheme header
|
|
field.
|
|
|
|
method
|
|
Method of this stream. This is a value of :method header field.
|
|
|
|
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',
|
|
request_headers = [('content-length', '3')],
|
|
status=200,
|
|
body='foo')
|
|
|
|
self.push(path='/js/bootstrap.js',
|
|
method='GET',
|
|
request_headers = [('content-length', '10')],
|
|
status=200,
|
|
body='foobarbuzz')
|
|
|
|
self.send_response(status=200,
|
|
headers = [('content-type', 'text/plain')],
|
|
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()
|
|
|
|
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.
|
|
|
|
When changing existing source code, do not alter the copyright of
|
|
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).
|
|
|
|
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
|
|
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!
|
|
|
|
See `Contribution Guidelines
|
|
<https://nghttp2.org/documentation/contribute.html>`_ for more
|
|
details.
|