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  <div class="section" id="wsgirestrictstdout">
<h1>WSGIRestrictStdout<a class="headerlink" href="#wsgirestrictstdout" title="Permalink to this headline">¶</a></h1>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Description:</th><td class="field-body">Enable restrictions on use of STDOUT.</td>
</tr>
<tr class="field-even field"><th class="field-name">Syntax:</th><td class="field-body"><tt class="docutils literal"><span class="pre">WSGIRestrictStdout</span> <span class="pre">On|Off</span></tt></td>
</tr>
<tr class="field-odd field"><th class="field-name">Default:</th><td class="field-body"><tt class="docutils literal"><span class="pre">WSGIRestrictStdout</span> <span class="pre">On</span></tt></td>
</tr>
<tr class="field-even field"><th class="field-name">Context:</th><td class="field-body">server config</td>
</tr>
</tbody>
</table>
<p>A well behaved Python WSGI application should never attempt to write any
data directly to <tt class="docutils literal"><span class="pre">sys.stdout</span></tt> or use the <tt class="docutils literal"><span class="pre">print</span></tt> statement without
directing it to an alternate file object. This is because ways of hosting
WSGI applications such as CGI use standard output as the mechanism for
sending the content of a response back to the web server. If a WSGI
application were to directly write to <tt class="docutils literal"><span class="pre">sys.stdout</span></tt> it could interfere
with the operation of the WSGI adapter and result in corruption of the
output stream.</p>
<p>In the interests of promoting portability of WSGI applications, mod_wsgi
restricts access to <tt class="docutils literal"><span class="pre">sys.stdout</span></tt> and will raise an exception if an
attempt is made to use <tt class="docutils literal"><span class="pre">sys.stdout</span></tt> explicitly.</p>
<p>The only time that one might want to remove this restriction is purely out
of convencience of being able to use the <tt class="docutils literal"><span class="pre">print</span></tt> statement during
debugging of an application, or if some third party module or WSGI
application was errornously using <tt class="docutils literal"><span class="pre">print</span></tt> when it shouldn&#8217;t. If
restrictions on using <tt class="docutils literal"><span class="pre">sys.stdout</span></tt> are removed, any data written to
it will instead be sent through to <tt class="docutils literal"><span class="pre">sys.stderr</span></tt> and will appear in
the Apache error log file.</p>
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