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