<div id="path">
<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">How-To / Tutorials</a></div><div id="page-content"><div id="preamble"><h1>HTTP/2 guide</h1>
<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/howto/http2.html" title="English"> en </a></p>
+<p><span>Available Languages: </span><a href="../en/howto/http2.html" title="English"> en </a> |
+<a href="../fr/howto/http2.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
</div>
<p>This is the howto guide for the HTTP/2 implementation in Apache httpd. This
what kind of PUSHes it accepts.</p>
</div></div>
<div class="bottomlang">
-<p><span>Available Languages: </span><a href="../en/howto/http2.html" title="English"> en </a></p>
+<p><span>Available Languages: </span><a href="../en/howto/http2.html" title="English"> en </a> |
+<a href="../fr/howto/http2.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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# Missing CRLF<br />
GET / HTTP/1.0\n\n
</code></p></div>
+ <div class="warning"><h3>Command line tools and CRLF</h3>
+ <p>Some tools need to be forced to use CRLF, otherwise httpd will return
+ a HTTP 400 response like described in the above use case. For example,
+ the <strong>OpenSSL s_client needs the -crlf parameter to work
+ properly</strong>.</p>
+ <p>The <code class="directive"><a href="../mod/mod_dumpio.html#dumpioinput">DumpIOInput</a></code> directive
+ can help while reviewing the HTTP request to identify issues like the
+ absence of CRLF.</p>
+ </div>
</dd>
<dt>RegisteredMethods|LenientMethods</dt>
<dd>