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  <h1>Source code for django.views.decorators.vary</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">wraps</span>

<span class="kn">from</span> <span class="nn">django.utils.cache</span> <span class="k">import</span> <span class="n">patch_vary_headers</span>
<span class="kn">from</span> <span class="nn">django.utils.decorators</span> <span class="k">import</span> <span class="n">available_attrs</span>


<div class="viewcode-block" id="vary_on_headers"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.vary.vary_on_headers">[docs]</a><span class="k">def</span> <span class="nf">vary_on_headers</span><span class="p">(</span><span class="o">*</span><span class="n">headers</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    A view decorator that adds the specified headers to the Vary header of the</span>
<span class="sd">    response. Usage:</span>

<span class="sd">       @vary_on_headers(&#39;Cookie&#39;, &#39;Accept-language&#39;)</span>
<span class="sd">       def index(request):</span>
<span class="sd">           ...</span>

<span class="sd">    Note that the header names are not case-sensitive.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">def</span> <span class="nf">decorator</span><span class="p">(</span><span class="n">func</span><span class="p">):</span>
        <span class="nd">@wraps</span><span class="p">(</span><span class="n">func</span><span class="p">,</span> <span class="n">assigned</span><span class="o">=</span><span class="n">available_attrs</span><span class="p">(</span><span class="n">func</span><span class="p">))</span>
        <span class="k">def</span> <span class="nf">inner_func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
            <span class="n">response</span> <span class="o">=</span> <span class="n">func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
            <span class="n">patch_vary_headers</span><span class="p">(</span><span class="n">response</span><span class="p">,</span> <span class="n">headers</span><span class="p">)</span>
            <span class="k">return</span> <span class="n">response</span>
        <span class="k">return</span> <span class="n">inner_func</span>
    <span class="k">return</span> <span class="n">decorator</span></div>


<div class="viewcode-block" id="vary_on_cookie"><a class="viewcode-back" href="../../../../topics/http/decorators.html#django.views.decorators.vary.vary_on_cookie">[docs]</a><span class="k">def</span> <span class="nf">vary_on_cookie</span><span class="p">(</span><span class="n">func</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    A view decorator that adds &quot;Cookie&quot; to the Vary header of a response. This</span>
<span class="sd">    indicates that a page&#39;s contents depends on cookies. Usage:</span>

<span class="sd">        @vary_on_cookie</span>
<span class="sd">        def index(request):</span>
<span class="sd">            ...</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="nd">@wraps</span><span class="p">(</span><span class="n">func</span><span class="p">,</span> <span class="n">assigned</span><span class="o">=</span><span class="n">available_attrs</span><span class="p">(</span><span class="n">func</span><span class="p">))</span>
    <span class="k">def</span> <span class="nf">inner_func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="n">response</span> <span class="o">=</span> <span class="n">func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
        <span class="n">patch_vary_headers</span><span class="p">(</span><span class="n">response</span><span class="p">,</span> <span class="p">(</span><span class="s1">&#39;Cookie&#39;</span><span class="p">,))</span>
        <span class="k">return</span> <span class="n">response</span>
    <span class="k">return</span> <span class="n">inner_func</span></div>
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