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  <div class="section" id="module-werkzeug.contrib.lint">
<span id="lint-validation-middleware"></span><h1>Lint Validation Middleware<a class="headerlink" href="#module-werkzeug.contrib.lint" 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 provides a middleware that performs sanity checks of the WSGI
application.  It checks that <span class="target" id="index-0"></span><a class="pep reference external" href="https://www.python.org/dev/peps/pep-0333"><strong>PEP 333</strong></a> is properly implemented and warns
on some common HTTP errors such as non-empty responses for 304 status
codes.</p>
<p>This module provides a middleware, the <a class="reference internal" href="#werkzeug.contrib.lint.LintMiddleware" title="werkzeug.contrib.lint.LintMiddleware"><code class="xref py py-class docutils literal"><span class="pre">LintMiddleware</span></code></a>.  Wrap your
application with it and it will warn about common problems with WSGI and
HTTP while your application is running.</p>
<p>It&#8217;s strongly recommended to use it during development.</p>
<dl class="class">
<dt id="werkzeug.contrib.lint.LintMiddleware">
<em class="property">class </em><code class="descclassname">werkzeug.contrib.lint.</code><code class="descname">LintMiddleware</code><span class="sig-paren">(</span><em>app</em><span class="sig-paren">)</span><a class="headerlink" href="#werkzeug.contrib.lint.LintMiddleware" title="Permalink to this definition"></a></dt>
<dd><p>This middleware wraps an application and warns on common errors.
Among other thing it currently checks for the following problems:</p>
<ul class="simple">
<li>invalid status codes</li>
<li>non-bytestrings sent to the WSGI server</li>
<li>strings returned from the WSGI application</li>
<li>non-empty conditional responses</li>
<li>unquoted etags</li>
<li>relative URLs in the Location header</li>
<li>unsafe calls to wsgi.input</li>
<li>unclosed iterators</li>
</ul>
<p>Detected errors are emitted using the standard Python <code class="xref py py-mod docutils literal"><span class="pre">warnings</span></code>
system and usually end up on <code class="xref py py-data docutils literal"><span class="pre">stderr</span></code>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">werkzeug.contrib.lint</span> <span class="kn">import</span> <span class="n">LintMiddleware</span>
<span class="n">app</span> <span class="o">=</span> <span class="n">LintMiddleware</span><span class="p">(</span><span class="n">app</span><span class="p">)</span>
</pre></div>
</div>
<table class="docutils field-list" frame="void" rules="none">
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<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>app</strong> &#8211; the application to wrap</td>
</tr>
</tbody>
</table>
</dd></dl>

</div>


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