<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang=""> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>django.middleware.http — Django 1.8.19 documentation</title> <link rel="stylesheet" href="../../../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../../', VERSION: '1.8.19', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../../_static/jquery.js"></script> <script type="text/javascript" src="../../../_static/underscore.js"></script> <script type="text/javascript" src="../../../_static/doctools.js"></script> <link rel="index" title="Index" href="../../../genindex.html" /> <link rel="search" title="Search" href="../../../search.html" /> <link rel="top" title="Django 1.8.19 documentation" href="../../../contents.html" /> <link rel="up" title="django" href="../../django.html" /> <script type="text/javascript" src="../../../templatebuiltins.js"></script> <script type="text/javascript"> (function($) { if (!django_template_builtins) { // templatebuiltins.js missing, do nothing. return; } $(document).ready(function() { // Hyperlink Django template tags and filters var base = "../../../ref/templates/builtins.html"; if (base == "#") { // Special case for builtins.html itself base = ""; } // Tags are keywords, class '.k' $("div.highlight\\-html\\+django span.k").each(function(i, elem) { var tagname = $(elem).text(); if ($.inArray(tagname, django_template_builtins.ttags) != -1) { var fragment = tagname.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>"); } }); // Filters are functions, class '.nf' $("div.highlight\\-html\\+django span.nf").each(function(i, elem) { var filtername = $(elem).text(); if ($.inArray(filtername, django_template_builtins.tfilters) != -1) { var fragment = filtername.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>"); } }); }); })(jQuery); </script> </head> <body role="document"> <div class="document"> <div id="custom-doc" class="yui-t6"> <div id="hd"> <h1><a href="../../../index.html">Django 1.8.19 documentation</a></h1> <div id="global-nav"> <a title="Home page" href="../../../index.html">Home</a> | <a title="Table of contents" href="../../../contents.html">Table of contents</a> | <a title="Global index" href="../../../genindex.html">Index</a> | <a title="Module index" href="../../../py-modindex.html">Modules</a> </div> <div class="nav"> <a href="../../index.html" title="Module code" accesskey="U">up</a></div> </div> <div id="bd"> <div id="yui-main"> <div class="yui-b"> <div class="yui-g" id="_modules-django-middleware-http"> <h1>Source code for django.middleware.http</h1><div class="highlight"><pre> <span></span><span class="kn">from</span> <span class="nn">django.utils.http</span> <span class="k">import</span> <span class="n">http_date</span><span class="p">,</span> <span class="n">parse_http_date_safe</span> <div class="viewcode-block" id="ConditionalGetMiddleware"><a class="viewcode-back" href="../../../ref/middleware.html#django.middleware.http.ConditionalGetMiddleware">[docs]</a><span class="k">class</span> <span class="nc">ConditionalGetMiddleware</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Handles conditional GET operations. If the response has an ETag or</span> <span class="sd"> Last-Modified header, and the request has If-None-Match or</span> <span class="sd"> If-Modified-Since, the response is replaced by an HttpNotModified.</span> <span class="sd"> Also sets the Date and Content-Length response-headers.</span> <span class="sd"> """</span> <span class="k">def</span> <span class="nf">process_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">response</span><span class="p">):</span> <span class="n">response</span><span class="p">[</span><span class="s1">'Date'</span><span class="p">]</span> <span class="o">=</span> <span class="n">http_date</span><span class="p">()</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">response</span><span class="o">.</span><span class="n">streaming</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">response</span><span class="o">.</span><span class="n">has_header</span><span class="p">(</span><span class="s1">'Content-Length'</span><span class="p">):</span> <span class="n">response</span><span class="p">[</span><span class="s1">'Content-Length'</span><span class="p">]</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">response</span><span class="o">.</span><span class="n">content</span><span class="p">))</span> <span class="c1"># If-None-Match must be ignored if original result would be anything</span> <span class="c1"># other than a 2XX or 304 status. 304 status would result in no change.</span> <span class="c1"># http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26</span> <span class="k">if</span> <span class="mi">200</span> <span class="o"><=</span> <span class="n">response</span><span class="o">.</span><span class="n">status_code</span> <span class="o"><</span> <span class="mi">300</span> <span class="ow">and</span> <span class="n">response</span><span class="o">.</span><span class="n">has_header</span><span class="p">(</span><span class="s1">'ETag'</span><span class="p">):</span> <span class="n">if_none_match</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">META</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'HTTP_IF_NONE_MATCH'</span><span class="p">)</span> <span class="k">if</span> <span class="n">if_none_match</span> <span class="o">==</span> <span class="n">response</span><span class="p">[</span><span class="s1">'ETag'</span><span class="p">]:</span> <span class="c1"># Setting the status is enough here. The response handling path</span> <span class="c1"># automatically removes content for this status code (in</span> <span class="c1"># http.conditional_content_removal()).</span> <span class="n">response</span><span class="o">.</span><span class="n">status_code</span> <span class="o">=</span> <span class="mi">304</span> <span class="c1"># If-Modified-Since must be ignored if the original result was not a 200.</span> <span class="c1"># http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25</span> <span class="k">if</span> <span class="n">response</span><span class="o">.</span><span class="n">status_code</span> <span class="o">==</span> <span class="mi">200</span> <span class="ow">and</span> <span class="n">response</span><span class="o">.</span><span class="n">has_header</span><span class="p">(</span><span class="s1">'Last-Modified'</span><span class="p">):</span> <span class="n">if_modified_since</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">META</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'HTTP_IF_MODIFIED_SINCE'</span><span class="p">)</span> <span class="k">if</span> <span class="n">if_modified_since</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span> <span class="n">if_modified_since</span> <span class="o">=</span> <span class="n">parse_http_date_safe</span><span class="p">(</span><span class="n">if_modified_since</span><span class="p">)</span> <span class="k">if</span> <span class="n">if_modified_since</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span> <span class="n">last_modified</span> <span class="o">=</span> <span class="n">parse_http_date_safe</span><span class="p">(</span><span class="n">response</span><span class="p">[</span><span class="s1">'Last-Modified'</span><span class="p">])</span> <span class="k">if</span> <span class="n">last_modified</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">last_modified</span> <span class="o"><=</span> <span class="n">if_modified_since</span><span class="p">:</span> <span class="c1"># Setting the status code is enough here (same reasons as</span> <span class="c1"># above).</span> <span class="n">response</span><span class="o">.</span><span class="n">status_code</span> <span class="o">=</span> <span class="mi">304</span> <span class="k">return</span> <span class="n">response</span></div> </pre></div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3>Browse</h3> <ul> </ul> <h3>You are here:</h3> <ul> <li> <a href="../../../index.html">Django 1.8.19 documentation</a> <ul><li><a href="../../index.html">Module code</a> <ul><li><a href="../../django.html">django</a> <ul><li>django.middleware.http</li></ul> </li></ul></li></ul> </li> </ul> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <form class="search" action="../../../search.html" method="get"> <div><input type="text" name="q" /></div> <div><input type="submit" value="Go" /></div> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <h3>Last update:</h3> <p class="topless">Mar 10, 2018</p> </div> </div> <div id="ft"> <div class="nav"> <a href="../../index.html" title="Module code" accesskey="U">up</a></div> </div> </div> <div class="clearer"></div> </div> </body> </html>