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<div class="section" id="nghttp2-http-2-0-c-library">
<h1>nghttp2 - HTTP/2.0 C Library<a class="headerlink" href="#nghttp2-http-2-0-c-library" title="Permalink to this headline"></a></h1>
<p>This is an experimental implementation of Hypertext Transfer Protocol
version 2.0.</p>
<div class="section" id="development-status">
<h2>Development Status<a class="headerlink" href="#development-status" title="Permalink to this headline"></a></h2>
<p>We started to implement HTTP-defat-04/2.0
(<a class="reference external" href="http://tools.ietf.org/html/draft-ietf-httpbis-http2-04">http://tools.ietf.org/html/draft-ietf-httpbis-http2-04</a>) based on
spdylay code base.</p>
<p>The following features are not implemented:</p>
<ul class="simple">
<li>Header continuation</li>
<li>ALPN: instead, NPN is used</li>
<li>HTTP Upgrade dance</li>
</ul>
</div>
<div class="section" id="requirements">
<h2>Requirements<a class="headerlink" href="#requirements" title="Permalink to this headline"></a></h2>
<p>The following packages are needed to build the library:</p>
<ul class="simple">
<li>pkg-config &gt;= 0.20</li>
<li>zlib &gt;= 1.2.3</li>
</ul>
<p>To build and run the unit test programs, the following packages are
required:</p>
<ul class="simple">
<li>cunit &gt;= 2.1</li>
</ul>
<p>To build and run the application programs (<tt class="docutils literal"><span class="pre">nghttp</span></tt>, <tt class="docutils literal"><span class="pre">nghttpd</span></tt> and
<tt class="docutils literal"><span class="pre">nghttpx</span></tt>) in <tt class="docutils literal"><span class="pre">src</span></tt> directory, the following packages are
required:</p>
<ul class="simple">
<li>OpenSSL &gt;= 1.0.1</li>
<li>libevent-openssl &gt;= 2.0.8</li>
</ul>
<p>To enable SPDY protocol in the application program <tt class="docutils literal"><span class="pre">nghttpx</span></tt>, the
following packages are required:</p>
<ul class="simple">
<li>spdylay &gt;= 1.0.0</li>
</ul>
<p>To enable <tt class="docutils literal"><span class="pre">-a</span></tt> option (getting linked assets from the downloaded
resouce) in <tt class="docutils literal"><span class="pre">nghttp</span></tt>, the following
packages are needed:</p>
<ul class="simple">
<li>libxml2 &gt;= 2.7.7</li>
</ul>
<p>If you are using Ubuntu 12.04, you need the following packages
installed:</p>
<ul class="simple">
<li>autoconf</li>
<li>automake</li>
<li>autotools-dev</li>
<li>libtool</li>
<li>pkg-config</li>
<li>zlib1g-dev</li>
<li>libcunit1-dev</li>
<li>libssl-dev</li>
<li>libxml2-dev</li>
<li>libevent-dev</li>
</ul>
<p>spdylay is not packaged in Ubuntu, so you need to build it yourself:
<a class="reference external" href="http://spdylay.sourceforge.net/">http://spdylay.sourceforge.net/</a></p>
</div>
<div class="section" id="build-from-git">
<h2>Build from git<a class="headerlink" href="#build-from-git" title="Permalink to this headline"></a></h2>
<p>Building from git is easy, but please be sure that at least autoconf 2.68 is
used:</p>
<div class="highlight-c"><pre>$ autoreconf -i
$ automake
$ autoconf
$ ./configure
$ make</pre>
</div>
</div>
<div class="section" id="building-documentation">
<h2>Building documentation<a class="headerlink" href="#building-documentation" title="Permalink to this headline"></a></h2>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Documentation is still incomplete.</p>
</div>
<p>To build documentation, run:</p>
<div class="highlight-c"><pre>$ make html</pre>
</div>
<p>The documents will be generated under <tt class="docutils literal"><span class="pre">doc/manual/html/</span></tt>.</p>
<p>The generated documents will not be installed with <tt class="docutils literal"><span class="pre">make</span> <span class="pre">install</span></tt>.</p>
</div>
<div class="section" id="client-server-and-proxy-programs">
<h2>Client, Server and Proxy programs<a class="headerlink" href="#client-server-and-proxy-programs" title="Permalink to this headline"></a></h2>
<p>The src directory contains HTTP/2.0 client, server and proxy programs.</p>
<div class="section" id="nghttp-client">
<h3>nghttp - client<a class="headerlink" href="#nghttp-client" title="Permalink to this headline"></a></h3>
<p><tt class="docutils literal"><span class="pre">nghttp</span></tt> is HTTP-default04/2.0 client. It can connect to the
HTTP/2.0 server with prior knowledge (without HTTP Upgrade) and NPN in
TLS extension.</p>
<p>By default, it uses SSL/TLS connection. Use <tt class="docutils literal"><span class="pre">--no-tls</span></tt> option to
disable it.</p>
<p>It has verbose output mode for framing information. Here is sample
output from <tt class="docutils literal"><span class="pre">nghttp</span></tt> client:</p>
<div class="highlight-c"><pre>$ src/nghttp -nv https://localhost:3000/
[ 0.000] NPN select next protocol: the remote server offers:
* HTTP-draft-04/2.0
* spdy/3
* spdy/2
* http/1.1
NPN selected the protocol: HTTP-draft-04/2.0
[ 0.005] send SETTINGS frame &lt;length=0, flags=0, stream_id=0&gt;
(niv=0)
[ 0.005] send HEADERS frame &lt;length=58, flags=5, stream_id=1&gt;
; END_STREAM | END_HEADERS
; Open new stream
:host: localhost:3000
:method: GET
:path: /
:scheme: https
accept: */*
accept-encoding: gzip, deflate
user-agent: nghttp2/0.1.0-DEV
[ 0.005] recv SETTINGS frame &lt;length=16, flags=0, stream_id=0&gt;
(niv=2)
[4:100]
[7:65536]
[ 0.005] recv WINDOW_UPDATE frame &lt;length=4, flags=1, stream_id=0&gt;
; END_FLOW_CONTROL
(window_size_increment=0)
[ 0.006] recv HEADERS frame &lt;length=179, flags=4, stream_id=1&gt;
; END_HEADERS
; First response header
:status: 200 OK
accept-ranges: bytes
content-encoding: gzip
content-length: 56
content-type: text/html
date: Sat, 27 Jul 2013 12:08:56 GMT
etag: "cf405c-2d-45adabdf282c0"
last-modified: Tue, 04 Nov 2008 10:44:03 GMT
server: Apache/2.2.22 (Debian)
vary: Accept-Encoding
via: 1.1 nghttpx
[ 0.006] recv DATA frame (length=56, flags=0, stream_id=1)
[ 0.006] recv DATA frame (length=0, flags=1, stream_id=1)
[ 0.006] send GOAWAY frame &lt;length=8, flags=0, stream_id=0&gt;
(last_stream_id=0, error_code=NO_ERROR(0), opaque_data=)</pre>
</div>
</div>
<div class="section" id="nghttpd-server">
<h3>nghttpd - server<a class="headerlink" href="#nghttpd-server" title="Permalink to this headline"></a></h3>
<p><tt class="docutils literal"><span class="pre">nghttpd</span></tt> is static web server. It is single threaded and
multiplexes connections using non-blocking socket.</p>
<p>By default, it uses SSL/TLS connection. Use <tt class="docutils literal"><span class="pre">--no-tls</span></tt> option to
disable it.</p>
<p>Just like <tt class="docutils literal"><span class="pre">nghttp</span></tt>, it has verbose output mode for framing
information. Here is sample output from <tt class="docutils literal"><span class="pre">nghttpd</span></tt> server:</p>
<div class="highlight-c"><pre>$ src/nghttpd 3000 --no-tls -v
IPv4: listen on port 3000
IPv6: listen on port 3000
[id=1] [ 1.020] send SETTINGS frame &lt;length=8, flags=0, stream_id=0&gt;
(niv=1)
[4:100]
[id=1] [ 1.020] closed
[id=2] [ 1.838] send SETTINGS frame &lt;length=8, flags=0, stream_id=0&gt;
(niv=1)
[4:100]
[id=2] [ 1.838] recv SETTINGS frame &lt;length=0, flags=0, stream_id=0&gt;
(niv=0)
[id=2] [ 1.838] recv HEADERS frame &lt;length=58, flags=5, stream_id=1&gt;
; END_STREAM | END_HEADERS
; Open new stream
:host: localhost:3000
:method: GET
:path: /
:scheme: http
accept: */*
accept-encoding: gzip, deflate
user-agent: nghttp2/0.1.0-DEV
[id=2] [ 1.838] send HEADERS frame &lt;length=105, flags=4, stream_id=1&gt;
; END_HEADERS
; First response header
:status: 404 Not Found
content-encoding: gzip
content-type: text/html; charset=UTF-8
date: Sat, 27 Jul 2013 12:32:10 GMT
server: nghttpd nghttp2/0.1.0-DEV
[id=2] [ 1.838] send DATA frame (length=127, flags=0, stream_id=1)
[id=2] [ 1.838] send DATA frame (length=0, flags=1, stream_id=1)
[id=2] [ 1.838] stream_id=1 closed
[id=2] [ 1.839] closed</pre>
</div>
</div>
<div class="section" id="nghttpx-proxy">
<h3>nghttpx - proxy<a class="headerlink" href="#nghttpx-proxy" title="Permalink to this headline"></a></h3>
<p>The <tt class="docutils literal"><span class="pre">nghttpx</span></tt> is a multi-threaded reverse proxy for
HTTP-draft-04/2.0, SPDY/HTTPS. It has several operation modes:</p>
<table border="1" class="docutils">
<colgroup>
<col width="25%" />
<col width="33%" />
<col width="11%" />
<col width="31%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Mode option</th>
<th class="head">Frontend</th>
<th class="head">Backend</th>
<th class="head">Note</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>default</td>
<td>HTTP/2.0, SPDY, HTTPS</td>
<td>HTTP/1.1</td>
<td>Reverse proxy</td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">--spdy</span></tt></td>
<td>HTTP/2.0, SPDY, HTTPS</td>
<td>HTTP/1.1</td>
<td>SPDY proxy</td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">--spdy-bridge</span></tt></td>
<td>HTTP/2.0, SPDY, HTTPS</td>
<td>HTTP/2.0</td>
<td>SPDY proxy</td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">--client</span></tt></td>
<td>HTTP/1.1</td>
<td>HTTP/2.0</td>
<td>1.1 &lt;-&gt; 2.0 conversion</td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">--client-proxy</span></tt></td>
<td>HTTP/1.1</td>
<td>HTTP/2.0</td>
<td>Forward proxy</td>
</tr>
</tbody>
</table>
<p>The interesting mode at the moment is the default mode. It works like
a reverse proxy and listens HTTP-draft-04/2.0 as well as SPDY and
HTTPS and can be deployed SSL/TLS terminator for existing web server.</p>
<p>By default, it uses SSL/TLS connection for HTTP/2.0 and SPDY. Use
<tt class="docutils literal"><span class="pre">--frontend-spdy--no-tls</span></tt> to disable it in frontend
connection. Likewise, use <tt class="docutils literal"><span class="pre">--backend-spdy-no-tls</span></tt> option to disable
it in backend connection.</p>
<p>The <tt class="docutils literal"><span class="pre">nghttpx</span></tt> supports configuration file. See <tt class="docutils literal"><span class="pre">--conf</span></tt> option and
sample configuration file <tt class="docutils literal"><span class="pre">nghttpx.conf.sample</span></tt>.</p>
<p>The <tt class="docutils literal"><span class="pre">nghttpx</span></tt> is ported from <tt class="docutils literal"><span class="pre">shrpx</span></tt> in spdylay project, and it
still has SPDY color in option names. They will be fixed as the
development goes.</p>
<p>Without any of <tt class="docutils literal"><span class="pre">-s</span></tt>, <tt class="docutils literal"><span class="pre">--spdy-bridge</span></tt>, <tt class="docutils literal"><span class="pre">-p</span></tt> and <tt class="docutils literal"><span class="pre">--client</span></tt>
options, <tt class="docutils literal"><span class="pre">nghttpx</span></tt> works as reverse proxy to the backend server:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">Client</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">,</span> <span class="n">SPDY</span><span class="p">,</span> <span class="n">HTTPS</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">nghttpx</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">Web</span> <span class="n">Server</span>
<span class="p">[</span><span class="n">reverse</span> <span class="n">proxy</span><span class="p">]</span>
</pre></div>
</div>
<p>With <tt class="docutils literal"><span class="pre">-s</span></tt> option, it works as so called secure SPDY proxy:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">Client</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">,</span> <span class="n">SPDY</span><span class="p">,</span> <span class="n">HTTPS</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">nghttpx</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">Proxy</span>
<span class="p">[</span><span class="n">SPDY</span> <span class="n">proxy</span><span class="p">]</span> <span class="p">(</span><span class="n">e</span><span class="p">.</span><span class="n">g</span><span class="p">.,</span> <span class="n">Squid</span><span class="p">)</span>
</pre></div>
</div>
<p>The <tt class="docutils literal"><span class="pre">Client</span></tt> in the above is needs to be configured to use nghttpx as
secure SPDY proxy.</p>
<p>At the time of this writing, Chrome is the only browser which supports
secure SPDY proxy. The one way to configure Chrome to use secure SPDY
proxy is create proxy.pac script like this:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">function</span> <span class="nf">FindProxyForURL</span><span class="p">(</span><span class="n">url</span><span class="p">,</span> <span class="n">host</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="s">&quot;HTTPS SERVERADDR:PORT&quot;</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p><tt class="docutils literal"><span class="pre">SERVERADDR</span></tt> and <tt class="docutils literal"><span class="pre">PORT</span></tt> is the hostname/address and port of the
machine nghttpx is running. Please note that Chrome requires valid
certificate for secure SPDY proxy.</p>
<p>Then run chrome with the following arguments:</p>
<div class="highlight-c"><pre>$ google-chrome --proxy-pac-url=file:///path/to/proxy.pac --use-npn</pre>
</div>
<p>With <tt class="docutils literal"><span class="pre">--spdy-bridge</span></tt>, it accepts HTTP/2.0, SPDY and HTTPS
connections and communicates with backend in HTTP/2.0:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">Client</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">,</span> <span class="n">SPDY</span><span class="p">,</span> <span class="n">HTTPS</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">nghttpx</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">Web</span> <span class="n">or</span> <span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span> <span class="n">Proxy</span> <span class="n">etc</span>
<span class="p">[</span><span class="n">SPDY</span> <span class="n">bridge</span><span class="p">]</span> <span class="p">(</span><span class="n">e</span><span class="p">.</span><span class="n">g</span><span class="p">.,</span> <span class="n">nghttpx</span> <span class="o">-</span><span class="n">s</span><span class="p">)</span>
</pre></div>
</div>
<p>With <tt class="docutils literal"><span class="pre">-p</span></tt> option, it works as forward proxy and expects that the
backend is HTTP/2.0 proxy:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">Client</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">nghttpx</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span> <span class="n">Proxy</span>
<span class="p">[</span><span class="n">forward</span> <span class="n">proxy</span><span class="p">]</span> <span class="p">(</span><span class="n">e</span><span class="p">.</span><span class="n">g</span><span class="p">.,</span> <span class="n">nghttpx</span> <span class="o">-</span><span class="n">s</span><span class="p">)</span>
</pre></div>
</div>
<p>The <tt class="docutils literal"><span class="pre">Client</span></tt> is needs to be configured to use nghttpx as forward proxy.</p>
<p>With the above configuration, one can use HTTP/1.1 client to access
and test their HTTP/2.0 servers.</p>
<p>With <tt class="docutils literal"><span class="pre">--client</span></tt> option, it works as reverse proxy and expects that
the backend is HTTP/2.0 Web server:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">Client</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">nghttpx</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">Web</span> <span class="n">Server</span>
<span class="p">[</span><span class="n">reverse</span> <span class="n">proxy</span><span class="p">]</span>
</pre></div>
</div>
<p>For the operation modes which talk to the backend in HTTP/2.0, the
backend connections can be tunneled though HTTP proxy. The proxy is
specified using <tt class="docutils literal"><span class="pre">--backend-http-proxy-uri</span></tt> option. The following
figure illustrates the example of <tt class="docutils literal"><span class="pre">--spdy-bridge</span></tt> and
<tt class="docutils literal"><span class="pre">--backend-http-proxy-uri</span></tt> option to talk to the outside HTTP/2.0 proxy
through HTTP proxy:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="n">Client</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">,</span> <span class="n">SPDY</span><span class="p">,</span> <span class="n">HTTPS</span><span class="p">)</span> <span class="o">--&gt;</span> <span class="n">nghttpx</span> <span class="o">&lt;--</span> <span class="p">(</span><span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span><span class="p">)</span> <span class="o">--</span>
<span class="p">[</span><span class="n">SPDY</span> <span class="n">bridge</span><span class="p">]</span>
<span class="o">--===================---&gt;</span> <span class="n">HTTP</span><span class="o">/</span><span class="mf">2.0</span> <span class="n">Proxy</span>
<span class="p">(</span><span class="n">HTTP</span> <span class="n">proxy</span> <span class="n">tunnel</span><span class="p">)</span> <span class="p">(</span><span class="n">e</span><span class="p">.</span><span class="n">g</span><span class="p">.,</span> <span class="n">nghttpx</span> <span class="o">-</span><span class="n">s</span><span class="p">)</span>
</pre></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar">
<div class="sphinxsidebarwrapper"><h3>Menu</h3>
<ul>
<li><a href="https://github.com/tatsuhiro-t/nghttp2/issues">Issues</a></li>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">nghttp2 - HTTP/2.0 C Library</a><ul>
<li><a class="reference internal" href="#development-status">Development Status</a></li>
<li><a class="reference internal" href="#requirements">Requirements</a></li>
<li><a class="reference internal" href="#build-from-git">Build from git</a></li>
<li><a class="reference internal" href="#building-documentation">Building documentation</a></li>
<li><a class="reference internal" href="#client-server-and-proxy-programs">Client, Server and Proxy programs</a><ul>
<li><a class="reference internal" href="#nghttp-client">nghttp - client</a></li>
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