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<div class="section" id="libnghttp2-asio-high-level-http-2-c-library">
<h1>libnghttp2_asio: High level HTTP/2 C++ library<a class="headerlink" href="#libnghttp2-asio-high-level-http-2-c-library" title="Permalink to this headline"></a></h1>
<p>libnghttp2_asio is C++ library built on top of libnghttp2 and provides
high level abstraction API to build HTTP/2 applications. It depends
on Boost::ASIO library and OpenSSL. Currently libnghttp2_asio
provides server and client side API.</p>
<p>libnghttp2_asio is not built by default. Use <tt class="docutils literal"><span class="pre">--enable-asio-lib</span></tt>
configure flag to build libnghttp2_asio. The required Boost libraries
are:</p>
<ul class="simple">
<li>Boost::Asio</li>
<li>Boost::System</li>
<li>Boost::Thread</li>
</ul>
<p>We have 3 header files for this library:</p>
<ul class="simple">
<li><a class="reference internal" href="asio_http2_server.h.html"><em>asio_http2_server.h</em></a></li>
<li><a class="reference internal" href="asio_http2_client.h.html"><em>asio_http2_client.h</em></a></li>
<li><a class="reference internal" href="asio_http2.h.html"><em>asio_http2.h</em></a></li>
</ul>
<p>asio_http2.h is included from the other two files.</p>
<p>To build a program with libnghttp2_asio, link to the following
libraries:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="o">-</span><span class="n">lnghttp2_asio</span> <span class="o">-</span><span class="n">lboost_system</span>
</pre></div>
</div>
<p>If <tt class="docutils literal"><span class="pre">boost::asio::ssl</span></tt> is used in application code, OpenSSL is also
required in link line:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="o">-</span><span class="n">lnghttp2_asio</span> <span class="o">-</span><span class="n">lboost_system</span> <span class="o">-</span><span class="n">lssl</span> <span class="o">-</span><span class="n">lcrypto</span>
</pre></div>
</div>
<div class="section" id="server-api">
<h2>Server API<a class="headerlink" href="#server-api" title="Permalink to this headline"></a></h2>
<p>To use server API, first include following header file:</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include &lt;nghttp2/asio_http2_server.h&gt;</span>
</pre></div>
</div>
<p>Also take a look at that header file <a class="reference internal" href="asio_http2_server.h.html"><em>asio_http2_server.h</em></a>.</p>
<p>Server API is designed to build HTTP/2 server very easily to utilize
C++11 anonymous function and closure. The bare minimum example of
HTTP/2 server looks like this:</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="o">::</span><span class="n">server</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="n">http2</span> <span class="n">server</span><span class="p">;</span>
<span class="n">server</span><span class="p">.</span><span class="n">handle</span><span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">,</span> <span class="p">[](</span><span class="k">const</span> <span class="n">request</span> <span class="o">&amp;</span><span class="n">req</span><span class="p">,</span> <span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="n">res</span><span class="p">.</span><span class="n">write_head</span><span class="p">(</span><span class="mi">200</span><span class="p">);</span>
<span class="n">res</span><span class="p">.</span><span class="n">end</span><span class="p">(</span><span class="s">&quot;hello, world</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">);</span>
<span class="p">});</span>
<span class="k">if</span> <span class="p">(</span><span class="n">server</span><span class="p">.</span><span class="n">listen_and_serve</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="s">&quot;3000&quot;</span><span class="p">))</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;error: &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>First we instantiate <tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::http2</span></tt> object.
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::http2::handle</span></tt> function registers
pattern and its handler function. In this example, we register &quot;/&quot; as
pattern, which matches all requests. Then call
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::http2::listen_and_serve</span></tt> function with
address and port to listen to.</p>
<p>The <tt class="docutils literal"><span class="pre">req</span></tt> and <tt class="docutils literal"><span class="pre">res</span></tt> represent HTTP request and response
respectively. <tt class="docutils literal"><span class="pre">nghttp2::asio_http2_::server::response::write_head</span></tt>
constructs HTTP response header fields. The first argument is HTTP
status code, in the above example, which is 200. The second argument,
which is omitted in the above example, is additional header fields to
send.</p>
<p><tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::response::end</span></tt> sends responde body.
In the above example, we send string &quot;hello, world&quot;.</p>
<p>The life time of req and res object ends after the callback set by
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::response::on_close</span></tt> function.
Application must not use those objects after this call.</p>
<div class="section" id="serving-static-files-and-enabling-ssl-tls">
<h3>Serving static files and enabling SSL/TLS<a class="headerlink" href="#serving-static-files-and-enabling-ssl-tls" title="Permalink to this headline"></a></h3>
<p>In this example, we serve a couple of static files and also enable
SSL/TLS.</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include &lt;nghttp2/asio_http2_server.h&gt;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="o">::</span><span class="n">server</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span> <span class="n">tls</span><span class="p">(</span><span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span><span class="o">::</span><span class="n">sslv23</span><span class="p">);</span>
<span class="n">tls</span><span class="p">.</span><span class="n">use_private_key_file</span><span class="p">(</span><span class="s">&quot;server.key&quot;</span><span class="p">,</span> <span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span><span class="o">::</span><span class="n">pem</span><span class="p">);</span>
<span class="n">tls</span><span class="p">.</span><span class="n">use_certificate_chain_file</span><span class="p">(</span><span class="s">&quot;server.crt&quot;</span><span class="p">);</span>
<span class="n">configure_tls_context_easy</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="n">tls</span><span class="p">);</span>
<span class="n">http2</span> <span class="n">server</span><span class="p">;</span>
<span class="n">server</span><span class="p">.</span><span class="n">handle</span><span class="p">(</span><span class="s">&quot;/index.html&quot;</span><span class="p">,</span> <span class="p">[](</span><span class="k">const</span> <span class="n">request</span> <span class="o">&amp;</span><span class="n">req</span><span class="p">,</span> <span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="n">res</span><span class="p">.</span><span class="n">write_head</span><span class="p">(</span><span class="mi">200</span><span class="p">);</span>
<span class="n">res</span><span class="p">.</span><span class="n">end</span><span class="p">(</span><span class="n">file_generator</span><span class="p">(</span><span class="s">&quot;index.html&quot;</span><span class="p">));</span>
<span class="p">});</span>
<span class="k">if</span> <span class="p">(</span><span class="n">server</span><span class="p">.</span><span class="n">listen_and_serve</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="n">tls</span><span class="p">,</span> <span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="s">&quot;3000&quot;</span><span class="p">))</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;error: &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>We first create <tt class="docutils literal"><span class="pre">boost::asio::ssl::context</span></tt> object and set path to
private key file and certificate file.
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::configure_tls_context_easy</span></tt> function
configures SSL/TLS context object for HTTP/2 server use, including NPN
callbacks.</p>
<p>In the above example, if request path is &quot;/index.html&quot;, we serve
index.html file in the current working directory.
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::response::end</span></tt> has overload to take
function of type <tt class="docutils literal"><span class="pre">nghttp2::asio_http2::generator_cb</span></tt> and application
pass its implementation to generate response body. For the
convenience, libnghttp2_asio library provides
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::file_generator</span></tt> function to generate function
to server static file. If other resource is requested, server
automatically responds with 404 status code.</p>
</div>
<div class="section" id="server-push">
<h3>Server push<a class="headerlink" href="#server-push" title="Permalink to this headline"></a></h3>
<p>Server push is also supported.</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include &lt;nghttp2/asio_http2_server.h&gt;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="o">::</span><span class="n">server</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span> <span class="n">tls</span><span class="p">(</span><span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span><span class="o">::</span><span class="n">sslv23</span><span class="p">);</span>
<span class="n">tls</span><span class="p">.</span><span class="n">use_private_key_file</span><span class="p">(</span><span class="s">&quot;server.key&quot;</span><span class="p">,</span> <span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span><span class="o">::</span><span class="n">pem</span><span class="p">);</span>
<span class="n">tls</span><span class="p">.</span><span class="n">use_certificate_chain_file</span><span class="p">(</span><span class="s">&quot;server.crt&quot;</span><span class="p">);</span>
<span class="n">configure_tls_context_easy</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="n">tls</span><span class="p">);</span>
<span class="n">http2</span> <span class="n">server</span><span class="p">;</span>
<span class="n">std</span><span class="o">::</span><span class="n">string</span> <span class="n">style_css</span> <span class="o">=</span> <span class="s">&quot;h1 { color: green; }&quot;</span><span class="p">;</span>
<span class="n">server</span><span class="p">.</span><span class="n">handle</span><span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">,</span> <span class="p">[</span><span class="o">&amp;</span><span class="n">style_css</span><span class="p">](</span><span class="k">const</span> <span class="n">request</span> <span class="o">&amp;</span><span class="n">req</span><span class="p">,</span> <span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="k">auto</span> <span class="n">push</span> <span class="o">=</span> <span class="n">res</span><span class="p">.</span><span class="n">push</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="s">&quot;GET&quot;</span><span class="p">,</span> <span class="s">&quot;/style.css&quot;</span><span class="p">);</span>
<span class="n">push</span><span class="o">-&gt;</span><span class="n">write_head</span><span class="p">(</span><span class="mi">200</span><span class="p">);</span>
<span class="n">push</span><span class="o">-&gt;</span><span class="n">end</span><span class="p">(</span><span class="n">style_css</span><span class="p">);</span>
<span class="n">res</span><span class="p">.</span><span class="n">write_head</span><span class="p">(</span><span class="mi">200</span><span class="p">);</span>
<span class="n">res</span><span class="p">.</span><span class="n">end</span><span class="p">(</span><span class="n">R</span><span class="s">&quot;(</span>
<span class="o">&lt;!</span><span class="n">DOCTYPE</span> <span class="n">html</span><span class="o">&gt;&lt;</span><span class="n">html</span> <span class="n">lang</span><span class="o">=</span><span class="s">&quot;en&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">title</span><span class="o">&gt;</span><span class="n">HTTP</span><span class="o">/</span><span class="mi">2</span> <span class="n">FTW</span><span class="o">&lt;/</span><span class="n">title</span><span class="o">&gt;&lt;</span><span class="n">body</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">link</span> <span class="n">href</span><span class="o">=</span><span class="s">&quot;/style.css&quot;</span> <span class="n">rel</span><span class="o">=</span><span class="s">&quot;stylesheet&quot;</span> <span class="n">type</span><span class="o">=</span><span class="s">&quot;text/css&quot;</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="n">h1</span><span class="o">&gt;</span><span class="n">This</span> <span class="n">should</span> <span class="n">be</span> <span class="n">green</span><span class="o">&lt;/</span><span class="n">h1</span><span class="o">&gt;</span>
<span class="o">&lt;/</span><span class="n">body</span><span class="o">&gt;&lt;/</span><span class="n">html</span><span class="o">&gt;</span>
<span class="p">)</span><span class="s">&quot;);</span>
<span class="p">});</span>
<span class="n">server</span><span class="p">.</span><span class="n">handle</span><span class="p">(</span><span class="s">&quot;/style.css&quot;</span><span class="p">,</span>
<span class="p">[</span><span class="o">&amp;</span><span class="n">style_css</span><span class="p">](</span><span class="k">const</span> <span class="n">request</span> <span class="o">&amp;</span><span class="n">req</span><span class="p">,</span> <span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="n">res</span><span class="p">.</span><span class="n">write_head</span><span class="p">(</span><span class="mi">200</span><span class="p">);</span>
<span class="n">res</span><span class="p">.</span><span class="n">end</span><span class="p">(</span><span class="n">style_css</span><span class="p">);</span>
<span class="p">});</span>
<span class="k">if</span> <span class="p">(</span><span class="n">server</span><span class="p">.</span><span class="n">listen_and_serve</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="n">tls</span><span class="p">,</span> <span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="s">&quot;3000&quot;</span><span class="p">))</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;error: &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>When client requested any resource other than &quot;/style.css&quot;, we push
&quot;/style.css&quot;. To push resource, call
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::response::push</span></tt> function with desired
method and path. It returns another response object and use its
functions to send push response.</p>
</div>
<div class="section" id="enable-multi-threading">
<h3>Enable multi-threading<a class="headerlink" href="#enable-multi-threading" title="Permalink to this headline"></a></h3>
<p>Enabling multi-threading is very easy. Just call
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::http2::num_threads</span></tt> function with the
desired number of threads:</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="n">http2</span> <span class="n">server</span><span class="p">;</span>
<span class="c1">// Use 4 native threads</span>
<span class="n">server</span><span class="p">.</span><span class="n">num_threads</span><span class="p">(</span><span class="mi">4</span><span class="p">);</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="client-api">
<h2>Client API<a class="headerlink" href="#client-api" title="Permalink to this headline"></a></h2>
<p>To use client API, first include following header file:</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include &lt;nghttp2/asio_http2_client.h&gt;</span>
</pre></div>
</div>
<p>Also take a look at that header file <a class="reference internal" href="asio_http2_client.h.html"><em>asio_http2_client.h</em></a>.</p>
<p>Here is the sample client code to access HTTP/2 server and print out
response header fields and response body to the console screen:</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include &lt;iostream&gt;</span>
<span class="cp">#include &lt;nghttp2/asio_http2_client.h&gt;</span>
<span class="k">using</span> <span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ip</span><span class="o">::</span><span class="n">tcp</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="o">::</span><span class="n">client</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">io_service</span> <span class="n">io_service</span><span class="p">;</span>
<span class="c1">// connect to localhost:3000</span>
<span class="n">session</span> <span class="n">sess</span><span class="p">(</span><span class="n">io_service</span><span class="p">,</span> <span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="s">&quot;3000&quot;</span><span class="p">);</span>
<span class="n">sess</span><span class="p">.</span><span class="n">on_connect</span><span class="p">([</span><span class="o">&amp;</span><span class="n">sess</span><span class="p">](</span><span class="n">tcp</span><span class="o">::</span><span class="n">resolver</span><span class="o">::</span><span class="n">iterator</span> <span class="n">endpoint_it</span><span class="p">)</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="k">auto</span> <span class="n">req</span> <span class="o">=</span> <span class="n">sess</span><span class="p">.</span><span class="n">submit</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="s">&quot;GET&quot;</span><span class="p">,</span> <span class="s">&quot;http://localhost:3000/&quot;</span><span class="p">);</span>
<span class="n">req</span><span class="o">-&gt;</span><span class="n">on_response</span><span class="p">([](</span><span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// print status code and response header fields.</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;HTTP/2 &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">res</span><span class="p">.</span><span class="n">status_code</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span><span class="k">auto</span> <span class="o">&amp;</span><span class="nl">kv</span> <span class="p">:</span> <span class="n">res</span><span class="p">.</span><span class="n">header</span><span class="p">())</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="n">kv</span><span class="p">.</span><span class="n">first</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;: &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">kv</span><span class="p">.</span><span class="n">second</span><span class="p">.</span><span class="n">value</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="n">res</span><span class="p">.</span><span class="n">on_data</span><span class="p">([](</span><span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="kt">size_t</span> <span class="n">len</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*&gt;</span><span class="p">(</span><span class="n">data</span><span class="p">),</span> <span class="n">len</span><span class="p">);</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="n">req</span><span class="o">-&gt;</span><span class="n">on_close</span><span class="p">([</span><span class="o">&amp;</span><span class="n">sess</span><span class="p">](</span><span class="kt">uint32_t</span> <span class="n">error_code</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// shutdown session after first request was done.</span>
<span class="n">sess</span><span class="p">.</span><span class="n">shutdown</span><span class="p">();</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="n">sess</span><span class="p">.</span><span class="n">on_error</span><span class="p">([](</span><span class="k">const</span> <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="o">&amp;</span><span class="n">ec</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;error: &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="n">io_service</span><span class="p">.</span><span class="n">run</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</div>
<p><tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::session</span></tt> object takes
<tt class="docutils literal"><span class="pre">boost::asio::io_service</span></tt> object and remote server address. When
connection is made, the callback function passed to
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::on_connect</span></tt> is invoked with connected
address as its paramter. After this callback call, use
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::session::submit</span></tt> to send request to the
server. You can submit multiple requests at once without waiting for
the completion of previous request.</p>
<p>The life time of req and res object ends after the callback set by
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::request::on_close</span></tt> function.
Application must not use those objects after this call.</p>
<p>Normally, client does not stop even after all requests are done unless
connection is lost. To stop client, call
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::server::session::shutdown()</span></tt>.</p>
<div class="section" id="recieve-server-push-and-enable-ssl-tls">
<h3>Recieve server push and enable SSL/TLS<a class="headerlink" href="#recieve-server-push-and-enable-ssl-tls" title="Permalink to this headline"></a></h3>
<div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include &lt;iostream&gt;</span>
<span class="cp">#include &lt;nghttp2/asio_http2_client.h&gt;</span>
<span class="k">using</span> <span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ip</span><span class="o">::</span><span class="n">tcp</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="o">::</span><span class="n">client</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">io_service</span> <span class="n">io_service</span><span class="p">;</span>
<span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span> <span class="n">tls</span><span class="p">(</span><span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ssl</span><span class="o">::</span><span class="n">context</span><span class="o">::</span><span class="n">sslv23</span><span class="p">);</span>
<span class="n">tls</span><span class="p">.</span><span class="n">set_default_verify_paths</span><span class="p">();</span>
<span class="c1">// disabled to make development easier...</span>
<span class="c1">// tls_ctx.set_verify_mode(boost::asio::ssl::verify_peer);</span>
<span class="n">configure_tls_context</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="n">tls</span><span class="p">);</span>
<span class="c1">// connect to localhost:3000</span>
<span class="n">session</span> <span class="n">sess</span><span class="p">(</span><span class="n">io_service</span><span class="p">,</span> <span class="n">tls</span><span class="p">,</span> <span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="s">&quot;3000&quot;</span><span class="p">);</span>
<span class="n">sess</span><span class="p">.</span><span class="n">on_connect</span><span class="p">([</span><span class="o">&amp;</span><span class="n">sess</span><span class="p">](</span><span class="n">tcp</span><span class="o">::</span><span class="n">resolver</span><span class="o">::</span><span class="n">iterator</span> <span class="n">endpoint_it</span><span class="p">)</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="k">auto</span> <span class="n">req</span> <span class="o">=</span> <span class="n">sess</span><span class="p">.</span><span class="n">submit</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="s">&quot;GET&quot;</span><span class="p">,</span> <span class="s">&quot;http://localhost:3000/&quot;</span><span class="p">);</span>
<span class="n">req</span><span class="o">-&gt;</span><span class="n">on_response</span><span class="p">([</span><span class="o">&amp;</span><span class="n">sess</span><span class="p">](</span><span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;response received!&quot;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="n">res</span><span class="p">.</span><span class="n">on_data</span><span class="p">([</span><span class="o">&amp;</span><span class="n">sess</span><span class="p">](</span><span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="kt">size_t</span> <span class="n">len</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*&gt;</span><span class="p">(</span><span class="n">data</span><span class="p">),</span> <span class="n">len</span><span class="p">);</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="n">req</span><span class="o">-&gt;</span><span class="n">on_push</span><span class="p">([](</span><span class="k">const</span> <span class="n">request</span> <span class="o">&amp;</span><span class="n">push</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;push request received!&quot;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="n">push</span><span class="p">.</span><span class="n">on_response</span><span class="p">([](</span><span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;push response received!&quot;</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="n">res</span><span class="p">.</span><span class="n">on_data</span><span class="p">([](</span><span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="kt">size_t</span> <span class="n">len</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*&gt;</span><span class="p">(</span><span class="n">data</span><span class="p">),</span> <span class="n">len</span><span class="p">);</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="n">sess</span><span class="p">.</span><span class="n">on_error</span><span class="p">([](</span><span class="k">const</span> <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="o">&amp;</span><span class="n">ec</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;error: &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="n">io_service</span><span class="p">.</span><span class="n">run</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The above sample code demonstrates how to enable SSL/TLS and receive
server push. Currently,
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::configure_tls_context</span></tt> function setups
NPN callbacks for SSL/TLS context for HTTP/2 use.</p>
<p>To receive server push, use
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::request::on_push</span></tt> function to set
callback function which is invoked when server push request is
arrived. The callback function takes
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::request</span></tt> object, which contains the
pushed request. To get server push response, set callback using
<tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::request::on_response</span></tt>.</p>
<p>As stated in the previous section, client does not stop automatically
as long as HTTP/2 session is fine and connection is alive. We don't
call <tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::session::shutdown</span></tt> in this
example, so the program does not terminate after all responses are
received. Hit Ctrl-C to terminate the program.</p>
</div>
<div class="section" id="multiple-concurrent-requests">
<h3>Multiple concurrent requests<a class="headerlink" href="#multiple-concurrent-requests" title="Permalink to this headline"></a></h3>
<div class="highlight-cpp"><div class="highlight"><pre><span class="cp">#include &lt;iostream&gt;</span>
<span class="cp">#include &lt;nghttp2/asio_http2_client.h&gt;</span>
<span class="k">using</span> <span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">ip</span><span class="o">::</span><span class="n">tcp</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="p">;</span>
<span class="k">using</span> <span class="k">namespace</span> <span class="n">nghttp2</span><span class="o">::</span><span class="n">asio_http2</span><span class="o">::</span><span class="n">client</span><span class="p">;</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="n">boost</span><span class="o">::</span><span class="n">asio</span><span class="o">::</span><span class="n">io_service</span> <span class="n">io_service</span><span class="p">;</span>
<span class="c1">// connect to localhost:3000</span>
<span class="n">session</span> <span class="n">sess</span><span class="p">(</span><span class="n">io_service</span><span class="p">,</span> <span class="s">&quot;localhost&quot;</span><span class="p">,</span> <span class="s">&quot;3000&quot;</span><span class="p">);</span>
<span class="n">sess</span><span class="p">.</span><span class="n">on_connect</span><span class="p">([</span><span class="o">&amp;</span><span class="n">sess</span><span class="p">](</span><span class="n">tcp</span><span class="o">::</span><span class="n">resolver</span><span class="o">::</span><span class="n">iterator</span> <span class="n">endpoint_it</span><span class="p">)</span> <span class="p">{</span>
<span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="n">ec</span><span class="p">;</span>
<span class="k">auto</span> <span class="n">printer</span> <span class="o">=</span> <span class="p">[](</span><span class="k">const</span> <span class="n">response</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">)</span> <span class="p">{</span>
<span class="n">res</span><span class="p">.</span><span class="n">on_data</span><span class="p">([](</span><span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span> <span class="n">std</span><span class="o">::</span><span class="kt">size_t</span> <span class="n">len</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span><span class="p">.</span><span class="n">write</span><span class="p">(</span><span class="k">reinterpret_cast</span><span class="o">&lt;</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*&gt;</span><span class="p">(</span><span class="n">data</span><span class="p">),</span> <span class="n">len</span><span class="p">);</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="p">};</span>
<span class="n">std</span><span class="o">::</span><span class="kt">size_t</span> <span class="n">num</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span>
<span class="k">auto</span> <span class="n">count</span> <span class="o">=</span> <span class="n">std</span><span class="o">::</span><span class="n">make_shared</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="p">(</span><span class="n">num</span><span class="p">);</span>
<span class="k">for</span> <span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="kt">size_t</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">num</span><span class="p">;</span> <span class="o">++</span><span class="n">i</span><span class="p">)</span> <span class="p">{</span>
<span class="k">auto</span> <span class="n">req</span> <span class="o">=</span> <span class="n">sess</span><span class="p">.</span><span class="n">submit</span><span class="p">(</span><span class="n">ec</span><span class="p">,</span> <span class="s">&quot;GET&quot;</span><span class="p">,</span>
<span class="s">&quot;http://localhost:3000/&quot;</span> <span class="o">+</span> <span class="n">std</span><span class="o">::</span><span class="n">to_string</span><span class="p">(</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">));</span>
<span class="n">req</span><span class="o">-&gt;</span><span class="n">on_response</span><span class="p">(</span><span class="n">printer</span><span class="p">);</span>
<span class="n">req</span><span class="o">-&gt;</span><span class="n">on_close</span><span class="p">([</span><span class="o">&amp;</span><span class="n">sess</span><span class="p">,</span> <span class="n">count</span><span class="p">](</span><span class="kt">uint32_t</span> <span class="n">error_code</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="o">--*</span><span class="n">count</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// shutdown session after |num| requests were done.</span>
<span class="n">sess</span><span class="p">.</span><span class="n">shutdown</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="n">sess</span><span class="p">.</span><span class="n">on_error</span><span class="p">([](</span><span class="k">const</span> <span class="n">boost</span><span class="o">::</span><span class="n">system</span><span class="o">::</span><span class="n">error_code</span> <span class="o">&amp;</span><span class="n">ec</span><span class="p">)</span> <span class="p">{</span>
<span class="n">std</span><span class="o">::</span><span class="n">cerr</span> <span class="o">&lt;&lt;</span> <span class="s">&quot;error: &quot;</span> <span class="o">&lt;&lt;</span> <span class="n">ec</span><span class="p">.</span><span class="n">message</span><span class="p">()</span> <span class="o">&lt;&lt;</span> <span class="n">std</span><span class="o">::</span><span class="n">endl</span><span class="p">;</span>
<span class="p">});</span>
<span class="n">io_service</span><span class="p">.</span><span class="n">run</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Here is the sample to send 3 requests at once. Depending on the
server settings, these requests are processed out-of-order. In this
example, we have a trick to shutdown session after all requests were
done. We made <tt class="docutils literal"><span class="pre">count</span></tt> object which is shared pointer to int and is
initialized to 3. On each request closure (the invocation of the
callback set by <tt class="docutils literal"><span class="pre">nghttp2::asio_http2::client::request::on_close</span></tt>),
we decrement the count. If count becomes 0, we are sure that all
requests have been done and initiate shutdown.</p>
</div>
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