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  <div class="section" id="version-4-5-13">
<h1>Version 4.5.13<a class="headerlink" href="#version-4-5-13" title="Permalink to this headline">¶</a></h1>
<p>Version 4.5.13 of mod_wsgi can be obtained from:</p>
<blockquote>
<div><a class="reference external" href="https://codeload.github.com/GrahamDumpleton/mod_wsgi/tar.gz/4.5.13">https://codeload.github.com/GrahamDumpleton/mod_wsgi/tar.gz/4.5.13</a></div></blockquote>
<div class="section" id="new-features">
<h2>New Features<a class="headerlink" href="#new-features" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Added <tt class="docutils literal"><span class="pre">response-socket-timeout</span></tt> option to <tt class="docutils literal"><span class="pre">WSGIDaemonProcess</span></tt>
directive to allow the timeout on writes back to HTTP client from Apache
child worker process, when proxying responses from a mod_wsgi daemon
process, to be separately overridden. Previously this would use the value
of the Apache <tt class="docutils literal"><span class="pre">Timeout</span></tt> directive. With this change the timeout will be
based on <tt class="docutils literal"><span class="pre">response-socket-timeout</span></tt> option. If that is not set it will
use the the general <tt class="docutils literal"><span class="pre">socket-timeout</span></tt> option and if that isn&#8217;t set only
then will the value of the Apache <tt class="docutils literal"><span class="pre">Timeout</span></tt> directive be used.</p>
<p>The overall purpose of being able to separately control this option is to
combat against HTTP clients that never read the response, causing the
response buffer when proxying to fill up, which in turn can cause the
request thread in the daemon process to block. The default high value of
the Apache <tt class="docutils literal"><span class="pre">Timeout</span></tt> directive, at 300 seconds meant it could take a
while to clear, and if the mod_wsgi daemon processes were configured with
a low total number of request threads, the whole WSGI application could
block if this occurred for many requests at the same time.</p>
<p>When using <tt class="docutils literal"><span class="pre">mod_wsgi-express</span></tt> the option can be set using the command
line <tt class="docutils literal"><span class="pre">--response-socket-timeout</span></tt> option. If using <tt class="docutils literal"><span class="pre">mod_wsgi-express</span></tt>
the default socket timeout is 60 seconds so the issue would not have had
as big an impact, especially since <tt class="docutils literal"><span class="pre">mod_wsgi-express</span></tt> also defines a
default request timeout of 60 seconds, which would have resulted in the
daemon process being restarted if the request had blocked in returning
the response.</p>
<p>An additional error message is also now logged to indicate that failure
to proxy the response content was due to a socket timeout. This will help
to indentify where problems are due to a blocked connection or slow
client.</p>
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