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  <div class="section" id="macros">
<h1>Macros<a class="headerlink" href="#macros" title="Permalink to this headline"></a></h1>
<dl class="macro">
<dt id="c.NGHTTP2_VERSION">
<code class="descname">NGHTTP2_VERSION</code><a class="headerlink" href="#c.NGHTTP2_VERSION" title="Permalink to this definition"></a></dt>
<dd><p>Version number of the nghttp2 library release</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_VERSION_NUM">
<code class="descname">NGHTTP2_VERSION_NUM</code><a class="headerlink" href="#c.NGHTTP2_VERSION_NUM" title="Permalink to this definition"></a></dt>
<dd><p>Numerical representation of the version number of the nghttp2 library
release. This is a 24 bit number with 8 bits for major number, 8 bits
for minor and 8 bits for patch. Version 1.2.3 becomes 0x010203.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_PROTO_VERSION_ID">
<code class="descname">NGHTTP2_PROTO_VERSION_ID</code><a class="headerlink" href="#c.NGHTTP2_PROTO_VERSION_ID" title="Permalink to this definition"></a></dt>
<dd><p>The protocol version identification string of this library
supports.  This identifier is used if HTTP/2 is used over TLS.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_PROTO_VERSION_ID_LEN">
<code class="descname">NGHTTP2_PROTO_VERSION_ID_LEN</code><a class="headerlink" href="#c.NGHTTP2_PROTO_VERSION_ID_LEN" title="Permalink to this definition"></a></dt>
<dd><p>The length of <a class="reference internal" href="#c.NGHTTP2_PROTO_VERSION_ID" title="NGHTTP2_PROTO_VERSION_ID"><code class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_PROTO_VERSION_ID</span></code></a>.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_PROTO_ALPN">
<code class="descname">NGHTTP2_PROTO_ALPN</code><a class="headerlink" href="#c.NGHTTP2_PROTO_ALPN" title="Permalink to this definition"></a></dt>
<dd><p>The seriazlied form of ALPN protocol identifier this library
supports.  Notice that first byte is the length of following
protocol identifier.  This is the same wire format of <a class="reference external" href="https://tools.ietf.org/html/rfc7301">TLS ALPN
extension</a>.  This is useful
to process incoming ALPN tokens in wire format.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_PROTO_ALPN_LEN">
<code class="descname">NGHTTP2_PROTO_ALPN_LEN</code><a class="headerlink" href="#c.NGHTTP2_PROTO_ALPN_LEN" title="Permalink to this definition"></a></dt>
<dd><p>The length of <a class="reference internal" href="#c.NGHTTP2_PROTO_ALPN" title="NGHTTP2_PROTO_ALPN"><code class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_PROTO_ALPN</span></code></a>.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_CLEARTEXT_PROTO_VERSION_ID">
<code class="descname">NGHTTP2_CLEARTEXT_PROTO_VERSION_ID</code><a class="headerlink" href="#c.NGHTTP2_CLEARTEXT_PROTO_VERSION_ID" title="Permalink to this definition"></a></dt>
<dd><p>The protocol version identification string of this library
supports.  This identifier is used if HTTP/2 is used over cleartext
TCP.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN">
<code class="descname">NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN</code><a class="headerlink" href="#c.NGHTTP2_CLEARTEXT_PROTO_VERSION_ID_LEN" title="Permalink to this definition"></a></dt>
<dd><p>The length of <a class="reference internal" href="#c.NGHTTP2_CLEARTEXT_PROTO_VERSION_ID" title="NGHTTP2_CLEARTEXT_PROTO_VERSION_ID"><code class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_CLEARTEXT_PROTO_VERSION_ID</span></code></a>.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_VERSION_AGE">
<code class="descname">NGHTTP2_VERSION_AGE</code><a class="headerlink" href="#c.NGHTTP2_VERSION_AGE" title="Permalink to this definition"></a></dt>
<dd><p>The age of <a class="reference internal" href="types.html#c.nghttp2_info" title="nghttp2_info"><code class="xref c c-type docutils literal"><span class="pre">nghttp2_info</span></code></a></p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_DEFAULT_WEIGHT">
<code class="descname">NGHTTP2_DEFAULT_WEIGHT</code><a class="headerlink" href="#c.NGHTTP2_DEFAULT_WEIGHT" title="Permalink to this definition"></a></dt>
<dd><p>The default weight of stream dependency.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_MAX_WEIGHT">
<code class="descname">NGHTTP2_MAX_WEIGHT</code><a class="headerlink" href="#c.NGHTTP2_MAX_WEIGHT" title="Permalink to this definition"></a></dt>
<dd><p>The maximum weight of stream dependency.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_MIN_WEIGHT">
<code class="descname">NGHTTP2_MIN_WEIGHT</code><a class="headerlink" href="#c.NGHTTP2_MIN_WEIGHT" title="Permalink to this definition"></a></dt>
<dd><p>The minimum weight of stream dependency.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_MAX_WINDOW_SIZE">
<code class="descname">NGHTTP2_MAX_WINDOW_SIZE</code><a class="headerlink" href="#c.NGHTTP2_MAX_WINDOW_SIZE" title="Permalink to this definition"></a></dt>
<dd><p>The maximum window size</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_INITIAL_WINDOW_SIZE">
<code class="descname">NGHTTP2_INITIAL_WINDOW_SIZE</code><a class="headerlink" href="#c.NGHTTP2_INITIAL_WINDOW_SIZE" title="Permalink to this definition"></a></dt>
<dd><p>The initial window size for stream level flow control.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE">
<code class="descname">NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE</code><a class="headerlink" href="#c.NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE" title="Permalink to this definition"></a></dt>
<dd><p>The initial window size for connection level flow control.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_DEFAULT_HEADER_TABLE_SIZE">
<code class="descname">NGHTTP2_DEFAULT_HEADER_TABLE_SIZE</code><a class="headerlink" href="#c.NGHTTP2_DEFAULT_HEADER_TABLE_SIZE" title="Permalink to this definition"></a></dt>
<dd><p>The default header table size.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_CLIENT_MAGIC">
<code class="descname">NGHTTP2_CLIENT_MAGIC</code><a class="headerlink" href="#c.NGHTTP2_CLIENT_MAGIC" title="Permalink to this definition"></a></dt>
<dd><p>The client magic string, which is the first 24 bytes byte string of
client connection preface.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_CLIENT_MAGIC_LEN">
<code class="descname">NGHTTP2_CLIENT_MAGIC_LEN</code><a class="headerlink" href="#c.NGHTTP2_CLIENT_MAGIC_LEN" title="Permalink to this definition"></a></dt>
<dd><p>The length of <a class="reference internal" href="#c.NGHTTP2_CLIENT_MAGIC" title="NGHTTP2_CLIENT_MAGIC"><code class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_CLIENT_MAGIC</span></code></a>.</p>
</dd></dl>

<dl class="macro">
<dt id="c.NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS">
<code class="descname">NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS</code><a class="headerlink" href="#c.NGHTTP2_INITIAL_MAX_CONCURRENT_STREAMS" title="Permalink to this definition"></a></dt>
<dd><p>Default maximum number of incoming concurrent streams.  Use
<a class="reference internal" href="nghttp2_submit_settings.html#c.nghttp2_submit_settings" title="nghttp2_submit_settings"><code class="xref c c-func docutils literal"><span class="pre">nghttp2_submit_settings()</span></code></a> with
<a class="reference internal" href="enums.html#c.NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS" title="NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS"><code class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS</span></code></a> to change the
maximum number of incoming concurrent streams.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The maximum number of outgoing concurrent streams is 100 by
default.</p>
</div>
</dd></dl>

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