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  <div class="section" id="module-werkzeug.contrib.fixers">
<span id="fixers"></span><h1>Fixers<a class="headerlink" href="#module-werkzeug.contrib.fixers" title="Permalink to this headline"></a></h1>
<div class="versionadded">
<p><span class="versionmodified">New in version 0.5.</span></p>
</div>
<p>This module includes various helpers that fix bugs in web servers.  They may
be necessary for some versions of a buggy web server but not others.  We try
to stay updated with the status of the bugs as good as possible but you have
to make sure whether they fix the problem you encounter.</p>
<p>If you notice bugs in webservers not fixed in this module consider
contributing a patch.</p>
<dl class="class">
<dt id="werkzeug.contrib.fixers.CGIRootFix">
<em class="property">class </em><code class="descclassname">werkzeug.contrib.fixers.</code><code class="descname">CGIRootFix</code><span class="sig-paren">(</span><em>app</em>, <em>app_root='/'</em><span class="sig-paren">)</span><a class="headerlink" href="#werkzeug.contrib.fixers.CGIRootFix" title="Permalink to this definition"></a></dt>
<dd><p>Wrap the application in this middleware if you are using FastCGI or CGI
and you have problems with your app root being set to the cgi script&#8217;s path
instead of the path users are going to visit</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 0.9: </span>Added <cite>app_root</cite> parameter and renamed from <cite>LighttpdCGIRootFix</cite>.</p>
</div>
<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">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>app</strong> &#8211; the WSGI application</li>
<li><strong>app_root</strong> &#8211; Defaulting to <code class="docutils literal"><span class="pre">'/'</span></code>, you can set this to something else
if your app is mounted somewhere else.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="class">
<dt id="werkzeug.contrib.fixers.PathInfoFromRequestUriFix">
<em class="property">class </em><code class="descclassname">werkzeug.contrib.fixers.</code><code class="descname">PathInfoFromRequestUriFix</code><span class="sig-paren">(</span><em>app</em><span class="sig-paren">)</span><a class="headerlink" href="#werkzeug.contrib.fixers.PathInfoFromRequestUriFix" title="Permalink to this definition"></a></dt>
<dd><p>On windows environment variables are limited to the system charset
which makes it impossible to store the <cite>PATH_INFO</cite> variable in the
environment without loss of information on some systems.</p>
<p>This is for example a problem for CGI scripts on a Windows Apache.</p>
<p>This fixer works by recreating the <cite>PATH_INFO</cite> from <cite>REQUEST_URI</cite>,
<cite>REQUEST_URL</cite>, or <cite>UNENCODED_URL</cite> (whatever is available).  Thus the
fix can only be applied if the webserver supports either of these
variables.</p>
<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">Parameters:</th><td class="field-body"><strong>app</strong> &#8211; the WSGI application</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="class">
<dt id="werkzeug.contrib.fixers.ProxyFix">
<em class="property">class </em><code class="descclassname">werkzeug.contrib.fixers.</code><code class="descname">ProxyFix</code><span class="sig-paren">(</span><em>app</em>, <em>num_proxies=1</em><span class="sig-paren">)</span><a class="headerlink" href="#werkzeug.contrib.fixers.ProxyFix" title="Permalink to this definition"></a></dt>
<dd><p>This middleware can be applied to add HTTP proxy support to an
application that was not designed with HTTP proxies in mind.  It
sets <cite>REMOTE_ADDR</cite>, <cite>HTTP_HOST</cite> from <cite>X-Forwarded</cite> headers.  While
Werkzeug-based applications already can use
<a class="reference internal" href="../wsgi.html#werkzeug.wsgi.get_host" title="werkzeug.wsgi.get_host"><code class="xref py py-func docutils literal"><span class="pre">werkzeug.wsgi.get_host()</span></code></a> to retrieve the current host even if
behind proxy setups, this middleware can be used for applications which
access the WSGI environment directly.</p>
<p>If you have more than one proxy server in front of your app, set
<cite>num_proxies</cite> accordingly.</p>
<p>Do not use this middleware in non-proxy setups for security reasons.</p>
<p>The original values of <cite>REMOTE_ADDR</cite> and <cite>HTTP_HOST</cite> are stored in
the WSGI environment as <cite>werkzeug.proxy_fix.orig_remote_addr</cite> and
<cite>werkzeug.proxy_fix.orig_http_host</cite>.</p>
<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">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>app</strong> &#8211; the WSGI application</li>
<li><strong>num_proxies</strong> &#8211; the number of proxy servers in front of the app.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<dl class="method">
<dt id="werkzeug.contrib.fixers.ProxyFix.get_remote_addr">
<code class="descname">get_remote_addr</code><span class="sig-paren">(</span><em>forwarded_for</em><span class="sig-paren">)</span><a class="headerlink" href="#werkzeug.contrib.fixers.ProxyFix.get_remote_addr" title="Permalink to this definition"></a></dt>
<dd><p>Selects the new remote addr from the given list of ips in
X-Forwarded-For.  By default it picks the one that the <cite>num_proxies</cite>
proxy server provides.  Before 0.9 it would always pick the first.</p>
<div class="versionadded">
<p><span class="versionmodified">New in version 0.8.</span></p>
</div>
</dd></dl>

</dd></dl>

<dl class="class">
<dt id="werkzeug.contrib.fixers.HeaderRewriterFix">
<em class="property">class </em><code class="descclassname">werkzeug.contrib.fixers.</code><code class="descname">HeaderRewriterFix</code><span class="sig-paren">(</span><em>app</em>, <em>remove_headers=None</em>, <em>add_headers=None</em><span class="sig-paren">)</span><a class="headerlink" href="#werkzeug.contrib.fixers.HeaderRewriterFix" title="Permalink to this definition"></a></dt>
<dd><p>This middleware can remove response headers and add others.  This
is for example useful to remove the <cite>Date</cite> header from responses if you
are using a server that adds that header, no matter if it&#8217;s present or
not or to add <cite>X-Powered-By</cite> headers:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">app</span> <span class="o">=</span> <span class="n">HeaderRewriterFix</span><span class="p">(</span><span class="n">app</span><span class="p">,</span> <span class="n">remove_headers</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;Date&#39;</span><span class="p">],</span>
                        <span class="n">add_headers</span><span class="o">=</span><span class="p">[(</span><span class="s1">&#39;X-Powered-By&#39;</span><span class="p">,</span> <span class="s1">&#39;WSGI&#39;</span><span class="p">)])</span>
</pre></div>
</div>
<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">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>app</strong> &#8211; the WSGI application</li>
<li><strong>remove_headers</strong> &#8211; a sequence of header keys that should be
removed.</li>
<li><strong>add_headers</strong> &#8211; a sequence of <code class="docutils literal"><span class="pre">(key,</span> <span class="pre">value)</span></code> tuples that should
be added.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="class">
<dt id="werkzeug.contrib.fixers.InternetExplorerFix">
<em class="property">class </em><code class="descclassname">werkzeug.contrib.fixers.</code><code class="descname">InternetExplorerFix</code><span class="sig-paren">(</span><em>app</em>, <em>fix_vary=True</em>, <em>fix_attach=True</em><span class="sig-paren">)</span><a class="headerlink" href="#werkzeug.contrib.fixers.InternetExplorerFix" title="Permalink to this definition"></a></dt>
<dd><p>This middleware fixes a couple of bugs with Microsoft Internet
Explorer.  Currently the following fixes are applied:</p>
<ul class="simple">
<li>removing of <cite>Vary</cite> headers for unsupported mimetypes which
causes troubles with caching.  Can be disabled by passing
<code class="docutils literal"><span class="pre">fix_vary=False</span></code> to the constructor.
see: <a class="reference external" href="http://support.microsoft.com/kb/824847/en-us">http://support.microsoft.com/kb/824847/en-us</a></li>
<li>removes offending headers to work around caching bugs in
Internet Explorer if <cite>Content-Disposition</cite> is set.  Can be
disabled by passing <code class="docutils literal"><span class="pre">fix_attach=False</span></code> to the constructor.</li>
</ul>
<p>If it does not detect affected Internet Explorer versions it won&#8217;t touch
the request / response.</p>
</dd></dl>

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