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nghttp2 - HTTP/2 C Library
==========================
This is an implementation of the Hypertext Transfer Protocol version 2
in C.
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
HTTP/2.
An HPACK encoder and decoder are available as a public API.
Development Status
------------------
nghttp2 was originally developed based on `RFC 7540
<https://tools.ietf.org/html/rfc7540>`_ HTTP/2 and `RFC 7541
<https://tools.ietf.org/html/rfc7541>`_ HPACK - Header Compression for
HTTP/2. Now we are updating our code to implement `RFC 9113
<https://datatracker.ietf.org/doc/html/rfc9113>`_.
The nghttp2 code base was forked from the spdylay
(https://github.com/tatsuhiro-t/spdylay) project.
Public Test Server
------------------
The following endpoints are available to try out our nghttp2
implementation.
* https://nghttp2.org/ (TLS + ALPN/NPN and HTTP/3)
This endpoint supports ``h2``, ``h2-16``, ``h2-14``, and
 ``http/1.1`` via ALPN/NPN and requires TLSv1.2 for HTTP/2
 connection.
It also supports HTTP/3.
* http://nghttp2.org/ (HTTP Upgrade and HTTP/2 Direct)
``h2c`` and ``http/1.1``.
Requirements
------------
The following package is required to build the libnghttp2 library:
* pkg-config >= 0.20
To build and run the unit test programs, the following package is
required:
* cunit >= 2.1
To build the documentation, you need to install:
* sphinx (http://sphinx-doc.org/)
If you need libnghttp2 (C library) only, then the above packages are
all you need. Use ``--enable-lib-only`` to ensure that only
libnghttp2 is built. This avoids potential build error related to
building bundled applications.
To build and run the application programs (``nghttp``, ``nghttpd``,
``nghttpx`` and ``h2load``) in the ``src`` directory, the following packages
are required:
* OpenSSL >= 1.0.1
* libev >= 4.11
* zlib >= 1.2.3
* libc-ares >= 1.7.5
ALPN support requires OpenSSL >= 1.0.2 (released 22 January 2015).
LibreSSL >= 2.2.0 can be used instead of OpenSSL, but OpenSSL has more
features than LibreSSL at the time of this writing.
To enable ``-a`` option (getting linked assets from the downloaded
resource) in ``nghttp``, the following package is required:
* libxml2 >= 2.6.26
To enable systemd support in nghttpx, the following package is
required:
* libsystemd-dev >= 209
The HPACK tools require the following package:
* jansson >= 2.5
To build sources under the examples directory, libevent is required:
* libevent-openssl >= 2.0.8
To mitigate heap fragmentation in long running server programs
(``nghttpd`` and ``nghttpx``), jemalloc is recommended:
* jemalloc
.. note::
 Alpine Linux currently does not support malloc replacement
 due to musl limitations. See details in issue `#762 <https://github.com/nghttp2/nghttp2/issues/762>`_.
libnghttp2_asio C++ library (deprecated, has moved to
https://github.com/nghttp2/nghttp2-asio) requires the following
packages:
* libboost-dev >= 1.54.0
* libboost-thread-dev >= 1.54.0
The Python bindings (deprecated) require the following packages:
* cython >= 0.19
* python >= 3.8
* python-setuptools
To enable mruby support for nghttpx, `mruby
<https://github.com/mruby/mruby>`_ is required. We need to build
mruby with C++ ABI explicitly turned on, and probably need other
mrgems, mruby is manged by git submodule under third-party/mruby
directory. Currently, mruby support for nghttpx is disabled by
default. To enable mruby support, use ``--with-mruby`` configure
option. Note that at the time of this writing, libmruby-dev and mruby
packages in Debian/Ubuntu are not usable for nghttp2, since they do
not enable C++ ABI. To build mruby, the following packages are
required:
* ruby
* bison
nghttpx supports `neverbleed <https://github.com/h2o/neverbleed>`_,
privilege separation engine for OpenSSL / LibreSSL. In short, it
minimizes the risk of private key leakage when serious bug like
Heartbleed is exploited. The neverbleed is disabled by default. To
enable it, use ``--with-neverbleed`` configure option.
To enable the experimental HTTP/3 support for h2load and nghttpx, the
following libraries are required:
* `OpenSSL with QUIC support
 <https://github.com/quictls/openssl/tree/OpenSSL_1_1_1s+quic>`_; or
 `BoringSSL <https://boringssl.googlesource.com/boringssl/>`_ (commit
 b2536a2c6234496ef609e7c909936bbf828dac6d)
* `ngtcp2 <https://github.com/ngtcp2/ngtcp2>`_ >= 0.10.0
* `nghttp3 <https://github.com/ngtcp2/nghttp3>`_ >= 0.7.0
Use ``--enable-http3`` configure option to enable HTTP/3 feature for
h2load and nghttpx.
In order to build optional eBPF program to direct an incoming QUIC UDP
datagram to a correct socket for nghttpx, the following libraries are
required:
* libbpf-dev >= 0.7.0
Use ``--with-libbpf`` configure option to build eBPF program.
libelf-dev is needed to build libbpf.
For Ubuntu 20.04, you can build libbpf from `the source code
<https://github.com/libbpf/libbpf/releases/tag/v1.0.1>`_. nghttpx
requires eBPF program for reloading its configuration and hot swapping
its executable.
Compiling libnghttp2 C source code requires a C99 compiler. gcc 4.8
is known to be adequate. In order to compile the C++ source code, gcc
>= 6.0 or clang >= 6.0 is required. C++ source code requires C++14
language features.
.. note::
To enable mruby support in nghttpx, and use ``--with-mruby``
 configure option.
.. note::
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
 on Mac OS X platform.
.. note::
To compile the associated applications (nghttp, nghttpd, nghttpx
 and h2load), you must use the ``--enable-app`` configure option and
 ensure that the specified requirements above are met. Normally,
 configure script checks required dependencies to build these
 applications, and enable ``--enable-app`` automatically, so you
 don't have to use it explicitly. But if you found that
 applications were not built, then using ``--enable-app`` may find
 that cause, such as the missing dependency.
.. note::
In order to detect third party libraries, pkg-config is used
 (however we don't use pkg-config for some libraries (e.g., libev)).
 By default, pkg-config searches ``*.pc`` file in the standard
 locations (e.g., /usr/lib/pkgconfig). If it is necessary to use
 ``*.pc`` file in the custom location, specify paths to
 ``PKG_CONFIG_PATH`` environment variable, and pass it to configure
 script, like so:
.. code-block:: text
$ ./configure PKG_CONFIG_PATH=/path/to/pkgconfig
For pkg-config managed libraries, ``*_CFLAG`` and ``*_LIBS``
 environment variables are defined (e.g., ``OPENSSL_CFLAGS``,
 ``OPENSSL_LIBS``). Specifying non-empty string to these variables
 completely overrides pkg-config. In other words, if they are
 specified, pkg-config is not used for detection, and user is
 responsible to specify the correct values to these variables. For
 complete list of these variables, run ``./configure -h``.
If you are using Ubuntu 22.04 LTS, run the following to install the
required packages:
.. code-block:: text
sudo apt-get install g++ clang make binutils autoconf automake \
 autotools-dev libtool pkg-config \
 zlib1g-dev libcunit1-dev libssl-dev libxml2-dev libev-dev \
 libevent-dev libjansson-dev \
 libc-ares-dev libjemalloc-dev libsystemd-dev \
 ruby-dev bison libelf-dev
Building nghttp2 from release tar archive
-----------------------------------------
The nghttp2 project regularly releases tar archives which includes
nghttp2 source code, and generated build files. They can be
downloaded from `Releases
<https://github.com/nghttp2/nghttp2/releases>`_ page.
Building nghttp2 from git requires autotools development packages.
Building from tar archives does not require them, and thus it is much
easier. The usual build step is as follows:
.. code-block:: text
$ tar xf nghttp2-X.Y.Z.tar.bz2
 $ cd nghttp2-X.Y.Z
 $ ./configure
 $ make
Building from git
-----------------
Building from git is easy, but please be sure that at least autoconf 2.68 is
used:
.. code-block:: text
$ git submodule update --init
 $ autoreconf -i
 $ automake
 $ autoconf
 $ ./configure
 $ make
Notes for building on Windows (MSVC)
------------------------------------
The easiest way to build native Windows nghttp2 dll is use `cmake
<https://cmake.org/>`_. The free version of `Visual C++ Build Tools
<http://landinghub.visualstudio.com/visual-cpp-build-tools>`_ works
fine.
1. Install cmake for windows
2. Open "Visual C++ ... Native Build Tool Command Prompt", and inside
 nghttp2 directly, run ``cmake``.
3. Then run ``cmake --build`` to build library.
4. nghttp2.dll, nghttp2.lib, nghttp2.exp are placed under lib directory.
Note that the above steps most likely produce nghttp2 library only.
No bundled applications are compiled.
Notes for building on Windows (Mingw/Cygwin)
--------------------------------------------
Under Mingw environment, you can only compile the library, it's
``libnghttp2-X.dll`` and ``libnghttp2.a``.
If you want to compile the applications(``h2load``, ``nghttp``,
``nghttpx``, ``nghttpd``), you need to use the Cygwin environment.
Under Cygwin environment, to compile the applications you need to
compile and install the libev first.
Secondly, you need to undefine the macro ``__STRICT_ANSI__``, if you
not, the functions ``fdopen``, ``fileno`` and ``strptime`` will not
available.
the sample command like this:
.. code-block:: text
$ export CFLAGS="-U__STRICT_ANSI__ -I$libev_PREFIX/include -L$libev_PREFIX/lib"
 $ export CXXFLAGS=$CFLAGS
 $ ./configure
 $ make
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.
Notes for installation on Linux systems
--------------------------------------------
After installing nghttp2 tool suite with ``make install`` one might experience a similar error:
.. code-block:: text
nghttpx: error while loading shared libraries: libnghttp2.so.14: cannot open shared object file: No such file or directory
This means that the tool is unable to locate the ``libnghttp2.so`` shared library.
To update the shared library cache run ``sudo ldconfig``.
Building the documentation
--------------------------
.. note::
Documentation is still incomplete.
To build the documentation, run:
.. code-block:: text
$ make html
The documents will be generated under ``doc/manual/html/``.
The generated documents will not be installed with ``make install``.
The online documentation is available at
https://nghttp2.org/documentation/
Build HTTP/3 enabled h2load and nghttpx
---------------------------------------
To build h2load and nghttpx with HTTP/3 feature enabled, run the
configure script with ``--enable-http3``.
For nghttpx to reload configurations and swapping its executable while
gracefully terminating old worker processes, eBPF is required. Run
the configure script with ``--enable-http3 --with-libbpf`` to build
eBPF program. The QUIC keying material must be set with
``--frontend-quic-secret-file`` in order to keep the existing
connections alive during reload.
The detailed steps to build HTTP/3 enabled h2load and nghttpx follow.
Build custom OpenSSL:
.. code-block:: text
$ git clone --depth 1 -b OpenSSL_1_1_1s+quic https://github.com/quictls/openssl
 $ cd openssl
 $ ./config --prefix=$PWD/build --openssldir=/etc/ssl
 $ make -j$(nproc)
 $ make install_sw
 $ cd ..
Build nghttp3:
.. code-block:: text
$ git clone --depth 1 -b v0.7.1 https://github.com/ngtcp2/nghttp3
 $ cd nghttp3
 $ autoreconf -i
 $ ./configure --prefix=$PWD/build --enable-lib-only
 $ make -j$(nproc)
 $ make install
 $ cd ..
Build ngtcp2:
.. code-block:: text
$ git clone --depth 1 -b v0.11.0 https://github.com/ngtcp2/ngtcp2
 $ cd ngtcp2
 $ autoreconf -i
 $ ./configure --prefix=$PWD/build --enable-lib-only \
 PKG_CONFIG_PATH="$PWD/../openssl/build/lib/pkgconfig"
 $ make -j$(nproc)
 $ make install
 $ cd ..
If your Linux distribution does not have libbpf-dev >= 0.7.0, build
from source:
.. code-block:: text
$ git clone --depth 1 -b v1.0.1 https://github.com/libbpf/libbpf
 $ cd libbpf
 $ PREFIX=$PWD/build make -C src install
 $ cd ..
Build nghttp2:
.. code-block:: text
$ git clone https://github.com/nghttp2/nghttp2
 $ cd nghttp2
 $ git submodule update --init
 $ autoreconf -i
 $ ./configure --with-mruby --with-neverbleed --enable-http3 --with-libbpf \
 --disable-python-bindings \
 CC=clang-14 CXX=clang++-14 \
 PKG_CONFIG_PATH="$PWD/../openssl/build/lib/pkgconfig:$PWD/../nghttp3/build/lib/pkgconfig:$PWD/../ngtcp2/build/lib/pkgconfig:$PWD/../libbpf/build/lib64/pkgconfig" \
 LDFLAGS="$LDFLAGS -Wl,-rpath,$PWD/../openssl/build/lib -Wl,-rpath,$PWD/../libbpf/build/lib64"
 $ make -j$(nproc)
The eBPF program ``reuseport_kern.o`` should be found under bpf
directory. Pass ``--quic-bpf-program-file=bpf/reuseport_kern.o``
option to nghttpx to load it. See also `HTTP/3 section in nghttpx -
HTTP/2 proxy - HOW-TO
<https://nghttp2.org/documentation/nghttpx-howto.html#http-3>`_.
Unit tests
----------
Unit tests are done by simply running ``make check``.
Integration tests
-----------------
We have the integration tests for the nghttpx proxy server. The tests are
written in the `Go programming language <http://golang.org/>`_ and uses
its testing framework. We depend on the following libraries:
* golang.org/x/net/http2
* golang.org/x/net/websocket
* https://github.com/tatsuhiro-t/go-nghttp2
Go modules will download these dependencies automatically.
To run the tests, run the following command under
``integration-tests`` directory:
.. code-block:: text
$ make it
Inside the tests, we use port 3009 to run the test subject server.
Migration from v0.7.15 or earlier
---------------------------------
nghttp2 v1.0.0 introduced several backward incompatible changes. In
this section, we describe these changes and how to migrate to v1.0.0.
ALPN protocol ID is now ``h2`` and ``h2c``
++++++++++++++++++++++++++++++++++++++++++
Previously we announced ``h2-14`` and ``h2c-14``. v1.0.0 implements
final protocol version, and we changed ALPN ID to ``h2`` and ``h2c``.
The macros ``NGHTTP2_PROTO_VERSION_ID``,
``NGHTTP2_PROTO_VERSION_ID_LEN``,
``NGHTTP2_CLEARTEXT_PROTO_VERSION_ID``, and
``NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN`` have been updated to
reflect this change.
Basically, existing applications do not have to do anything, just
recompiling is enough for this change.
Use word "client magic" where we use "client connection preface"
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
We use "client connection preface" to mean first 24 bytes of client
connection preface. This is technically not correct, since client
connection preface is composed of 24 bytes client magic byte string
followed by SETTINGS frame. For clarification, we call "client magic"
for this 24 bytes byte string and updated API.
* ``NGHTTP2_CLIENT_CONNECTION_PREFACE`` was replaced with
 ``NGHTTP2_CLIENT_MAGIC``.
* ``NGHTTP2_CLIENT_CONNECTION_PREFACE_LEN`` was replaced with
 ``NGHTTP2_CLIENT_MAGIC_LEN``.
* ``NGHTTP2_BAD_PREFACE`` was renamed as ``NGHTTP2_BAD_CLIENT_MAGIC``
The already deprecated ``NGHTTP2_CLIENT_CONNECTION_HEADER`` and
``NGHTTP2_CLIENT_CONNECTION_HEADER_LEN`` were removed.
If application uses these macros, just replace old ones with new ones.
Since v1.0.0, client magic is sent by library (see next subsection),
so client application may just remove these macro use.
Client magic is sent by library
+++++++++++++++++++++++++++++++
Previously nghttp2 library did not send client magic, which is first
24 bytes byte string of client connection preface, and client
applications have to send it by themselves. Since v1.0.0, client
magic is sent by library via first call of ``nghttp2_session_send()``
or ``nghttp2_session_mem_send()``.
The client applications which send client magic must remove the
relevant code.
Remove HTTP Alternative Services (Alt-Svc) related code
+++++++++++++++++++++++++++++++++++++++++++++++++++++++
Alt-Svc specification is not finalized yet. To make our API stable,
we have decided to remove all Alt-Svc related API from nghttp2.
* ``NGHTTP2_EXT_ALTSVC`` was removed.
* ``nghttp2_ext_altsvc`` was removed.
We have already removed the functionality of Alt-Svc in v0.7 series
and they have been essentially noop. The application using these
macro and struct, remove those lines.
Use nghttp2_error in nghttp2_on_invalid_frame_recv_callback
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Previously ``nghttp2_on_invalid_frame_recv_cb_called`` took the
``error_code``, defined in ``nghttp2_error_code``, as parameter. But
they are not detailed enough to debug. Therefore, we decided to use
more detailed ``nghttp2_error`` values instead.
The application using this callback should update the callback
signature. If it treats ``error_code`` as HTTP/2 error code, update
the code so that it is treated as ``nghttp2_error``.
Receive client magic by default
+++++++++++++++++++++++++++++++
Previously nghttp2 did not process client magic (24 bytes byte
string). To make it deal with it, we had to use
``nghttp2_option_set_recv_client_preface()``. Since v1.0.0, nghttp2
processes client magic by default and
``nghttp2_option_set_recv_client_preface()`` was removed.
Some application may want to disable this behaviour, so we added
``nghttp2_option_set_no_recv_client_magic()`` to achieve this.
The application using ``nghttp2_option_set_recv_client_preface()``
with nonzero value, just remove it.
The application using ``nghttp2_option_set_recv_client_preface()``
with zero value or not using it must use
``nghttp2_option_set_no_recv_client_magic()`` with nonzero value.
Client, Server and Proxy programs
---------------------------------
The ``src`` directory contains the HTTP/2 client, server and proxy programs.
nghttp - client
+++++++++++++++
``nghttp`` is a HTTP/2 client. It can connect to the HTTP/2 server
with prior knowledge, HTTP Upgrade and NPN/ALPN TLS extension.
It has verbose output mode for framing information. Here is sample
output from ``nghttp`` client:
.. code-block:: text
$ nghttp -nv https://nghttp2.org
 [ 0.190] Connected
 The negotiated protocol: h2
 [ 0.212] recv SETTINGS frame <length=12, flags=0x00, stream_id=0>
 (niv=2)
 [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
 [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
 [ 0.212] send SETTINGS frame <length=12, flags=0x00, stream_id=0>
 (niv=2)
 [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
 [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
 [ 0.212] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
 ; ACK
 (niv=0)
 [ 0.212] send PRIORITY frame <length=5, flags=0x00, stream_id=3>
 (dep_stream_id=0, weight=201, exclusive=0)
 [ 0.212] send PRIORITY frame <length=5, flags=0x00, stream_id=5>
 (dep_stream_id=0, weight=101, exclusive=0)
 [ 0.212] send PRIORITY frame <length=5, flags=0x00, stream_id=7>
 (dep_stream_id=0, weight=1, exclusive=0)
 [ 0.212] send PRIORITY frame <length=5, flags=0x00, stream_id=9>
 (dep_stream_id=7, weight=1, exclusive=0)
 [ 0.212] send PRIORITY frame <length=5, flags=0x00, stream_id=11>
 (dep_stream_id=3, weight=1, exclusive=0)
 [ 0.212] send HEADERS frame <length=39, flags=0x25, stream_id=13>
 ; END_STREAM | END_HEADERS | PRIORITY
 (padlen=0, dep_stream_id=11, weight=16, exclusive=0)
 ; Open new stream
 :method: GET
 :path: /
 :scheme: https
 :authority: nghttp2.org
 accept: */*
 accept-encoding: gzip, deflate
 user-agent: nghttp2/1.0.1-DEV
 [ 0.221] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
 ; ACK
 (niv=0)
 [ 0.221] recv (stream_id=13) :method: GET
 [ 0.221] recv (stream_id=13) :scheme: https
 [ 0.221] recv (stream_id=13) :path: /stylesheets/screen.css
 [ 0.221] recv (stream_id=13) :authority: nghttp2.org
 [ 0.221] recv (stream_id=13) accept-encoding: gzip, deflate
 [ 0.222] recv (stream_id=13) user-agent: nghttp2/1.0.1-DEV
 [ 0.222] recv PUSH_PROMISE frame <length=50, flags=0x04, stream_id=13>
 ; END_HEADERS
 (padlen=0, promised_stream_id=2)
 [ 0.222] recv (stream_id=13) :status: 200
 [ 0.222] recv (stream_id=13) date: Thu, 21 May 2015 16:38:14 GMT
 [ 0.222] recv (stream_id=13) content-type: text/html
 [ 0.222] recv (stream_id=13) last-modified: Fri, 15 May 2015 15:38:06 GMT
 [ 0.222] recv (stream_id=13) etag: W/"555612de-19f6"
 [ 0.222] recv (stream_id=13) link: </stylesheets/screen.css>; rel=preload; as=stylesheet
 [ 0.222] recv (stream_id=13) content-encoding: gzip
 [ 0.222] recv (stream_id=13) server: nghttpx nghttp2/1.0.1-DEV
 [ 0.222] recv (stream_id=13) via: 1.1 nghttpx
 [ 0.222] recv (stream_id=13) strict-transport-security: max-age=31536000
 [ 0.222] recv HEADERS frame <length=166, flags=0x04, stream_id=13>
 ; END_HEADERS
 (padlen=0)
 ; First response header
 [ 0.222] recv DATA frame <length=2601, flags=0x01, stream_id=13>
 ; END_STREAM
 [ 0.222] recv (stream_id=2) :status: 200
 [ 0.222] recv (stream_id=2) date: Thu, 21 May 2015 16:38:14 GMT
 [ 0.222] recv (stream_id=2) content-type: text/css
 [ 0.222] recv (stream_id=2) last-modified: Fri, 15 May 2015 15:38:06 GMT
 [ 0.222] recv (stream_id=2) etag: W/"555612de-9845"
 [ 0.222] recv (stream_id=2) content-encoding: gzip
 [ 0.222] recv (stream_id=2) server: nghttpx nghttp2/1.0.1-DEV
 [ 0.222] recv (stream_id=2) via: 1.1 nghttpx
 [ 0.222] recv (stream_id=2) strict-transport-security: max-age=31536000
 [ 0.222] recv HEADERS frame <length=32, flags=0x04, stream_id=2>
 ; END_HEADERS
 (padlen=0)
 ; First push response header
 [ 0.228] recv DATA frame <length=8715, flags=0x01, stream_id=2>
 ; END_STREAM
 [ 0.228] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
 (last_stream_id=2, error_code=NO_ERROR(0x00), opaque_data(0)=[])
The HTTP Upgrade is performed like so:
.. code-block:: text
$ nghttp -nvu http://nghttp2.org
 [ 0.011] Connected
 [ 0.011] HTTP Upgrade request
 GET / HTTP/1.1
 Host: nghttp2.org
 Connection: Upgrade, HTTP2-Settings
 Upgrade: h2c
 HTTP2-Settings: AAMAAABkAAQAAP__
 Accept: */*
 User-Agent: nghttp2/1.0.1-DEV
[ 0.018] HTTP Upgrade response
 HTTP/1.1 101 Switching Protocols
 Connection: Upgrade
 Upgrade: h2c
[ 0.018] HTTP Upgrade success
 [ 0.018] recv SETTINGS frame <length=12, flags=0x00, stream_id=0>
 (niv=2)
 [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
 [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
 [ 0.018] send SETTINGS frame <length=12, flags=0x00, stream_id=0>
 (niv=2)
 [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
 [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
 [ 0.018] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
 ; ACK
 (niv=0)
 [ 0.018] send PRIORITY frame <length=5, flags=0x00, stream_id=3>
 (dep_stream_id=0, weight=201, exclusive=0)
 [ 0.018] send PRIORITY frame <length=5, flags=0x00, stream_id=5>
 (dep_stream_id=0, weight=101, exclusive=0)
 [ 0.018] send PRIORITY frame <length=5, flags=0x00, stream_id=7>
 (dep_stream_id=0, weight=1, exclusive=0)
 [ 0.018] send PRIORITY frame <length=5, flags=0x00, stream_id=9>
 (dep_stream_id=7, weight=1, exclusive=0)
 [ 0.018] send PRIORITY frame <length=5, flags=0x00, stream_id=11>
 (dep_stream_id=3, weight=1, exclusive=0)
 [ 0.018] send PRIORITY frame <length=5, flags=0x00, stream_id=1>
 (dep_stream_id=11, weight=16, exclusive=0)
 [ 0.019] recv (stream_id=1) :method: GET
 [ 0.019] recv (stream_id=1) :scheme: http
 [ 0.019] recv (stream_id=1) :path: /stylesheets/screen.css
 [ 0.019] recv (stream_id=1) host: nghttp2.org
 [ 0.019] recv (stream_id=1) user-agent: nghttp2/1.0.1-DEV
 [ 0.019] recv PUSH_PROMISE frame <length=49, flags=0x04, stream_id=1>
 ; END_HEADERS
 (padlen=0, promised_stream_id=2)
 [ 0.019] recv (stream_id=1) :status: 200
 [ 0.019] recv (stream_id=1) date: Thu, 21 May 2015 16:39:16 GMT
 [ 0.019] recv (stream_id=1) content-type: text/html
 [ 0.019] recv (stream_id=1) content-length: 6646
 [ 0.019] recv (stream_id=1) last-modified: Fri, 15 May 2015 15:38:06 GMT
 [ 0.019] recv (stream_id=1) etag: "555612de-19f6"
 [ 0.019] recv (stream_id=1) link: </stylesheets/screen.css>; rel=preload; as=stylesheet
 [ 0.019] recv (stream_id=1) accept-ranges: bytes
 [ 0.019] recv (stream_id=1) server: nghttpx nghttp2/1.0.1-DEV
 [ 0.019] recv (stream_id=1) via: 1.1 nghttpx
 [ 0.019] recv HEADERS frame <length=157, flags=0x04, stream_id=1>
 ; END_HEADERS
 (padlen=0)
 ; First response header
 [ 0.019] recv DATA frame <length=6646, flags=0x01, stream_id=1>
 ; END_STREAM
 [ 0.019] recv (stream_id=2) :status: 200
 [ 0.019] recv (stream_id=2) date: Thu, 21 May 2015 16:39:16 GMT
 [ 0.019] recv (stream_id=2) content-type: text/css
 [ 0.019] recv (stream_id=2) content-length: 38981
 [ 0.019] recv (stream_id=2) last-modified: Fri, 15 May 2015 15:38:06 GMT
 [ 0.019] recv (stream_id=2) etag: "555612de-9845"
 [ 0.019] recv (stream_id=2) accept-ranges: bytes
 [ 0.019] recv (stream_id=2) server: nghttpx nghttp2/1.0.1-DEV
 [ 0.019] recv (stream_id=2) via: 1.1 nghttpx
 [ 0.019] recv HEADERS frame <length=36, flags=0x04, stream_id=2>
 ; END_HEADERS
 (padlen=0)
 ; First push response header
 [ 0.026] recv DATA frame <length=16384, flags=0x00, stream_id=2>
 [ 0.027] recv DATA frame <length=7952, flags=0x00, stream_id=2>
 [ 0.027] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=0>
 (window_size_increment=33343)
 [ 0.032] send WINDOW_UPDATE frame <length=4, flags=0x00, stream_id=2>
 (window_size_increment=33707)
 [ 0.032] recv DATA frame <length=14645, flags=0x01, stream_id=2>
 ; END_STREAM
 [ 0.032] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
 ; ACK
 (niv=0)
 [ 0.032] send GOAWAY frame <length=8, flags=0x00, stream_id=0>
 (last_stream_id=2, error_code=NO_ERROR(0x00), opaque_data(0)=[])
Using the ``-s`` option, ``nghttp`` prints out some timing information for
requests, sorted by completion time:
.. code-block:: text
$ nghttp -nas https://nghttp2.org/
 ***** Statistics *****
Request timing:
 responseEnd: the time when last byte of response was received
 relative to connectEnd
 requestStart: the time just before first byte of request was sent
 relative to connectEnd. If '*' is shown, this was
 pushed by server.
 process: responseEnd - requestStart
 code: HTTP status code
 size: number of bytes received as response body without
 inflation.
 URI: request URI
see http://www.w3.org/TR/resource-timing/#processing-model
sorted by 'complete'
id responseEnd requestStart process code size request path
 13 +37.19ms +280us 36.91ms 200 2K /
 2 +72.65ms * +36.38ms 36.26ms 200 8K /stylesheets/screen.css
 17 +77.43ms +38.67ms 38.75ms 200 3K /javascripts/octopress.js
 15 +78.12ms +38.66ms 39.46ms 200 3K /javascripts/modernizr-2.0.js
Using the ``-r`` option, ``nghttp`` writes more detailed timing data to
the given file in HAR format.
nghttpd - server
++++++++++++++++
``nghttpd`` is a multi-threaded static web server.
By default, it uses SSL/TLS connection. Use ``--no-tls`` option to
disable it.
``nghttpd`` only accepts HTTP/2 connections via NPN/ALPN or direct
HTTP/2 connections. No HTTP Upgrade is supported.
The ``-p`` option allows users to configure server push.
Just like ``nghttp``, it has a verbose output mode for framing
information. Here is sample output from ``nghttpd``:
.. code-block:: text
$ nghttpd --no-tls -v 8080
 IPv4: listen 0.0.0.0:8080
 IPv6: listen :::8080
 [id=1] [ 1.521] send SETTINGS frame <length=6, flags=0x00, stream_id=0>
 (niv=1)
 [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
 [id=1] [ 1.521] recv SETTINGS frame <length=12, flags=0x00, stream_id=0>
 (niv=2)
 [SETTINGS_MAX_CONCURRENT_STREAMS(0x03):100]
 [SETTINGS_INITIAL_WINDOW_SIZE(0x04):65535]
 [id=1] [ 1.521] recv SETTINGS frame <length=0, flags=0x01, stream_id=0>
 ; ACK
 (niv=0)
 [id=1] [ 1.521] recv PRIORITY frame <length=5, flags=0x00, stream_id=3>
 (dep_stream_id=0, weight=201, exclusive=0)
 [id=1] [ 1.521] recv PRIORITY frame <length=5, flags=0x00, stream_id=5>
 (dep_stream_id=0, weight=101, exclusive=0)
 [id=1] [ 1.521] recv PRIORITY frame <length=5, flags=0x00, stream_id=7>
 (dep_stream_id=0, weight=1, exclusive=0)
 [id=1] [ 1.521] recv PRIORITY frame <length=5, flags=0x00, stream_id=9>
 (dep_stream_id=7, weight=1, exclusive=0)
 [id=1] [ 1.521] recv PRIORITY frame <length=5, flags=0x00, stream_id=11>
 (dep_stream_id=3, weight=1, exclusive=0)
 [id=1] [ 1.521] recv (stream_id=13) :method: GET
 [id=1] [ 1.521] recv (stream_id=13) :path: /
 [id=1] [ 1.521] recv (stream_id=13) :scheme: http
 [id=1] [ 1.521] recv (stream_id=13) :authority: localhost:8080
 [id=1] [ 1.521] recv (stream_id=13) accept: */*
 [id=1] [ 1.521] recv (stream_id=13) accept-encoding: gzip, deflate
 [id=1] [ 1.521] recv (stream_id=13) user-agent: nghttp2/1.0.0-DEV
 [id=1] [ 1.521] recv HEADERS frame <length=41, flags=0x25, stream_id=13>
 ; END_STREAM | END_HEADERS | PRIORITY
 (padlen=0, dep_stream_id=11, weight=16, exclusive=0)
 ; Open new stream
 [id=1] [ 1.521] send SETTINGS frame <length=0, flags=0x01, stream_id=0>
 ; ACK
 (niv=0)
 [id=1] [ 1.521] send HEADERS frame <length=86, flags=0x04, stream_id=13>
 ; END_HEADERS
 (padlen=0)
 ; First response header
 :status: 200
 server: nghttpd nghttp2/1.0.0-DEV
 content-length: 10
 cache-control: max-age=3600
 date: Fri, 15 May 2015 14:49:04 GMT
 last-modified: Tue, 30 Sep 2014 12:40:52 GMT
 [id=1] [ 1.522] send DATA frame <length=10, flags=0x01, stream_id=13>
 ; END_STREAM
 [id=1] [ 1.522] stream_id=13 closed
 [id=1] [ 1.522] recv GOAWAY frame <length=8, flags=0x00, stream_id=0>
 (last_stream_id=0, error_code=NO_ERROR(0x00), opaque_data(0)=[])
 [id=1] [ 1.522] closed
nghttpx - proxy
+++++++++++++++
``nghttpx`` is a multi-threaded reverse proxy for HTTP/3, HTTP/2, and
HTTP/1.1, and powers http://nghttp2.org and supports HTTP/2 server
push.
We reworked ``nghttpx`` command-line interface, and as a result, there
are several incompatibles from 1.8.0 or earlier. This is necessary to
extend its capability, and secure the further feature enhancements in
the future release. Please read `Migration from nghttpx v1.8.0 or
earlier
<https://nghttp2.org/documentation/nghttpx-howto.html#migration-from-nghttpx-v1-8-0-or-earlier>`_
to know how to migrate from earlier releases.
``nghttpx`` implements `important performance-oriented features
<https://istlsfastyet.com/#server-performance>`_ in TLS, such as
session IDs, session tickets (with automatic key rotation), OCSP
stapling, dynamic record sizing, ALPN/NPN, forward secrecy and HTTP/2.
``nghttpx`` also offers the functionality to share session cache and
ticket keys among multiple ``nghttpx`` instances via memcached.
``nghttpx`` has 2 operation modes:
================== ======================== ================ =============
Mode option Frontend Backend Note
================== ======================== ================ =============
default mode HTTP/3, HTTP/2, HTTP/1.1 HTTP/1.1, HTTP/2 Reverse proxy
``--http2-proxy`` HTTP/3, HTTP/2, HTTP/1.1 HTTP/1.1, HTTP/2 Forward proxy
================== ======================== ================ =============
The interesting mode at the moment is the default mode. It works like
a reverse proxy and listens for HTTP/3, HTTP/2, and HTTP/1.1 and can
be deployed as a SSL/TLS terminator for existing web server.
In all modes, the frontend connections are encrypted by SSL/TLS by
default. To disable encryption, use the ``no-tls`` keyword in
``--frontend`` option. If encryption is disabled, incoming HTTP/1.1
connections can be upgraded to HTTP/2 through HTTP Upgrade. On the
other hard, backend connections are not encrypted by default. To
encrypt backend connections, use ``tls`` keyword in ``--backend``
option.
``nghttpx`` supports a configuration file. See the ``--conf`` option and
sample configuration file ``nghttpx.conf.sample``.
In the default mode, ``nghttpx`` works as reverse proxy to the backend
server:
.. code-block:: text
Client <-- (HTTP/3, HTTP/2, HTTP/1.1) --> nghttpx <-- (HTTP/1.1, HTTP/2) --> Web Server
 [reverse proxy]
With the ``--http2-proxy`` option, it works as forward proxy, and it
is so called secure HTTP/2 proxy:
.. code-block:: text
Client <-- (HTTP/3, HTTP/2, HTTP/1.1) --> nghttpx <-- (HTTP/1.1) --> Proxy
 [secure proxy] (e.g., Squid, ATS)
The ``Client`` in the above example needs to be configured to use
``nghttpx`` as secure proxy.
At the time of this writing, both Chrome and Firefox support secure
HTTP/2 proxy. One way to configure Chrome to use a secure proxy is to
create a proxy.pac script like this:
.. code-block:: javascript
function FindProxyForURL(url, host) {
 return "HTTPS SERVERADDR:PORT";
 }
``SERVERADDR`` and ``PORT`` is the hostname/address and port of the
machine nghttpx is running on. Please note that Chrome requires a valid
certificate for secure proxy.
Then run Chrome with the following arguments:
.. code-block:: text
$ google-chrome --proxy-pac-url=file:///path/to/proxy.pac --use-npn
The backend HTTP/2 connections can be tunneled through an HTTP proxy.
The proxy is specified using ``--backend-http-proxy-uri``. The
following figure illustrates how nghttpx talks to the outside HTTP/2
proxy through an HTTP proxy:
.. code-block:: text
Client <-- (HTTP/3, HTTP/2, HTTP/1.1) --> nghttpx <-- (HTTP/2) --
--===================---> HTTP/2 Proxy
 (HTTP proxy tunnel) (e.g., nghttpx -s)
Benchmarking tool
-----------------
The ``h2load`` program is a benchmarking tool for HTTP/3, HTTP/2, and
HTTP/1.1. The UI of ``h2load`` is heavily inspired by ``weighttp``
(https://github.com/lighttpd/weighttp). The typical usage is as
follows:
.. code-block:: text
$ h2load -n100000 -c100 -m100 https://localhost:8443/
 starting benchmark...
 spawning thread #0: 100 concurrent clients, 100000 total requests
 Protocol: TLSv1.2
 Cipher: ECDHE-RSA-AES128-GCM-SHA256
 Server Temp Key: ECDH P-256 256 bits
 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 771.26ms, 129658 req/s, 4.71MB/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: 3812300 bytes total, 1009900 bytes headers, 1000000 bytes data
 min max mean sd +/- sd
 time for request: 25.12ms 124.55ms 51.07ms 15.36ms 84.87%
 time for connect: 208.94ms 254.67ms 241.38ms 7.95ms 63.00%
 time to 1st byte: 209.11ms 254.80ms 241.51ms 7.94ms 63.00%
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.
.. warning::
**Don't use this tool against publicly available servers.** That is
 considered a DOS attack. Please only use it against your private
 servers.
If the experimental HTTP/3 is enabled, h2load can send requests to
HTTP/3 server. To do this, specify ``h3`` to ``--npn-list`` option
like so:
.. code-block:: text
$ h2load --npn-list h3 https://127.0.0.1:4433
HPACK tools
-----------
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.
deflatehd - header compressor
+++++++++++++++++++++++++++++
The ``deflatehd`` program reads JSON data or HTTP/1-style header fields from
stdin and outputs compressed header block in JSON.
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:
Example:
.. code-block:: text
:method: GET
 :scheme: https
 :path: /
: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.
input_length
 The sum of the length of the name/value pairs in the input.
output_length
 The length of the compressed header block.
percentage_of_original_size
 ``output_length`` / ``input_length`` * 100
wire
 The compressed header block as a hex string.
headers
 The input header set.
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 outside 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 has been deprecated, and moved to
https://github.com/nghttp2/nghttp2-asio.
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++14 anonymous functions and closures. The bare minimum example of
an HTTP/2 server looks like this:
.. code-block:: cpp
#include <iostream>
#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
---------------
Python bindings have been deprecated.
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/python3.8``).
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 python3
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.
Reporting vulnerability
-----------------------
If you find a vulnerability in our software, please send the email to
"tatsuhiro.t at gmail dot com" about its details instead of submitting
issues on github issue page. It is a standard practice not to
disclose vulnerability information publicly until a fixed version is
released, or mitigation is worked out.
In the future, we may setup a dedicated mail address for this purpose.
Release schedule
----------------
In general, we follow `Semantic Versioning <http://semver.org/>`_. We
release MINOR version update every month, and usually we ship it
around 25th day of every month.
We may release PATCH releases between the regular releases, mainly for
severe security bug fixes.
We have no plan to break API compatibility changes involving soname
bump, so MAJOR version will stay 1 for the foreseeable future.
License
-------
The MIT License