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  <section id="vmod-h2-module-to-control-the-built-in-http2-transport">
<span id="vmod-h2-3"></span><h1>VMOD h2 - Module to control the built-in HTTP2 transport<a class="headerlink" href="#vmod-h2-module-to-control-the-built-in-http2-transport" title="Link to this heading">¶</a></h1>
<section id="synopsis">
<h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Link to this heading">¶</a></h2>
<pre class="literal-block">import h2 [as name] [from &quot;path&quot;]

<a class="reference internal" href="#h2-rapid-reset"><span class="std std-ref">DURATION rapid_reset([DURATION threshold])</span></a>

<a class="reference internal" href="#h2-rapid-reset-limit"><span class="std std-ref">INT rapid_reset_limit([INT number])</span></a>

<a class="reference internal" href="#h2-rapid-reset-period"><span class="std std-ref">DURATION rapid_reset_period([DURATION duration])</span></a>

<a class="reference internal" href="#h2-rapid-reset-budget"><span class="std std-ref">REAL rapid_reset_budget()</span></a></pre>
</section>
<section id="description">
<h2>DESCRIPTION<a class="headerlink" href="#description" title="Link to this heading">¶</a></h2>
<p>This VMOD contains functions to control the HTTP2 transport built into
Varnish-Cache.</p>
<section id="bool-is">
<span id="h2-is"></span><h3>BOOL is()<a class="headerlink" href="#bool-is" title="Link to this heading">¶</a></h3>
<p>Restricted to: <code class="docutils literal notranslate"><span class="pre">client</span></code>.</p>
<p>Returns true when called on a session handled by the built-in HTTP2 transport.</p>
</section>
<section id="duration-rapid-reset-duration-threshold">
<span id="h2-rapid-reset"></span><h3>DURATION rapid_reset([DURATION threshold])<a class="headerlink" href="#duration-rapid-reset-duration-threshold" title="Link to this heading">¶</a></h3>
<p>Restricted to: <code class="docutils literal notranslate"><span class="pre">client</span></code>.</p>
<p>Get and optionally set the <code class="docutils literal notranslate"><span class="pre">h2_rapid_reset</span></code> parameter (See
<a class="reference internal" href="varnishd.html#varnishd-1"><span class="std std-ref">varnishd</span></a>) for this HTTP2 session only.</p>
<p>Returns -1 when used outside the HTTP2 transport. Otherwise returns
the previous value.</p>
<p>If the call leads to a change in the rate limit parameters, the
current budget as retuned by
<a class="reference internal" href="#h2-rapid-reset-budget">h2.rapid_reset_budget()</a> is reset.</p>
</section>
<section id="int-rapid-reset-limit-int-number">
<span id="h2-rapid-reset-limit"></span><h3>INT rapid_reset_limit([INT number])<a class="headerlink" href="#int-rapid-reset-limit-int-number" title="Link to this heading">¶</a></h3>
<p>Restricted to: <code class="docutils literal notranslate"><span class="pre">client</span></code>.</p>
<p>Get and optionally set the <code class="docutils literal notranslate"><span class="pre">h2_rapid_reset_limit</span></code> parameter (See
<a class="reference internal" href="varnishd.html#varnishd-1"><span class="std std-ref">varnishd</span></a>) for this HTTP2 session only.</p>
<p>Returns -1 when used outside the HTTP2 transport. Otherwise returns
the previous value.</p>
<p>If the call leads to a change in the rate limit parameters, the
current budget as retuned by
<a class="reference internal" href="#h2-rapid-reset-budget">h2.rapid_reset_budget()</a> is reset.</p>
</section>
<section id="duration-rapid-reset-period-duration-duration">
<span id="h2-rapid-reset-period"></span><h3>DURATION rapid_reset_period([DURATION duration])<a class="headerlink" href="#duration-rapid-reset-period-duration-duration" title="Link to this heading">¶</a></h3>
<p>Restricted to: <code class="docutils literal notranslate"><span class="pre">client</span></code>.</p>
<p>Get and optionally set the <code class="docutils literal notranslate"><span class="pre">h2_rapid_reset_period</span></code> parameter (See
<a class="reference internal" href="varnishd.html#varnishd-1"><span class="std std-ref">varnishd</span></a>) for this HTTP2 session only.</p>
<p>Returns -1 when used outside the HTTP2 transport. Otherwise returns
the previous value.</p>
<p>If the call leads to a change in the rate limit parameters, the
current budget as retuned by
<a class="reference internal" href="#h2-rapid-reset-budget">h2.rapid_reset_budget()</a> is reset.</p>
</section>
<section id="real-rapid-reset-budget">
<span id="h2-rapid-reset-budget"></span><h3>REAL rapid_reset_budget()<a class="headerlink" href="#real-rapid-reset-budget" title="Link to this heading">¶</a></h3>
<p>Restricted to: <code class="docutils literal notranslate"><span class="pre">client</span></code>.</p>
<p>Return how many RST frames classified as “rapid” the client is still
allowed to send before the session is going to be closed.</p>
</section>
</section>
<section id="see-also">
<h2>SEE ALSO<a class="headerlink" href="#see-also" title="Link to this heading">¶</a></h2>
<ul class="simple">
<li><p><a class="reference internal" href="varnishd.html#varnishd-1"><span class="std std-ref">varnishd</span></a></p></li>
<li><p><a class="reference internal" href="vsl.html#vsl-7"><span class="std std-ref">VSL</span></a></p></li>
</ul>
</section>
<section id="copyright">
<h2>COPYRIGHT<a class="headerlink" href="#copyright" title="Link to this heading">¶</a></h2>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>Copyright 2023 UPLEX - Nils Goroll Systemoptimierung
All rights reserved.

Author: Nils Goroll &lt;nils.goroll@uplex.de&gt;

SPDX-License-Identifier: BSD-2-Clause

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS&#39;&#39; AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
</pre></div>
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