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  <section id="altering-the-backend-response">
<h1>Altering the backend response<a class="headerlink" href="#altering-the-backend-response" title="Link to this heading">¶</a></h1>
<p>Here we override the TTL of a object coming from the backend if it
matches certain criteria:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sub</span> <span class="n">vcl_backend_response</span> <span class="p">{</span>
   <span class="k">if</span> <span class="p">(</span><span class="n">bereq</span><span class="o">.</span><span class="n">url</span> <span class="o">~</span> <span class="s2">&quot;\.(png|gif|jpg)$&quot;</span><span class="p">)</span> <span class="p">{</span>
     <span class="n">unset</span> <span class="n">beresp</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">set</span><span class="o">-</span><span class="n">cookie</span><span class="p">;</span>
     <span class="nb">set</span> <span class="n">beresp</span><span class="o">.</span><span class="n">ttl</span> <span class="o">=</span> <span class="mi">1</span><span class="n">h</span><span class="p">;</span>
  <span class="p">}</span>
<span class="p">}</span>
</pre></div>
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<p>We also remove any Set-Cookie headers in order to avoid creation of a
<cite>hit-for-miss</cite> object. See <a class="reference internal" href="../reference/vcl-step.html#vcl-actions"><span class="std std-ref">VCL Actions</span></a>.</p>
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