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<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>
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