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<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Manipulating request headers in VCL — Varnish version 7.1.1 documentation</title> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script src="../_static/jquery.js"></script> <script src="../_static/underscore.js"></script> <script src="../_static/doctools.js"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="next" title="Altering the backend response" href="vcl-example-manipulating-responses.html" /> <link rel="prev" title="VCL Examples" href="vcl-examples.html" /> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="vcl-example-manipulating-responses.html" title="Altering the backend response" accesskey="N">next</a> |</li> <li class="right" > <a href="vcl-examples.html" title="VCL Examples" accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 7.1.1 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Users Guide</a> »</li> <li class="nav-item nav-item-2"><a href="vcl.html" >VCL - Varnish Configuration Language</a> »</li> <li class="nav-item nav-item-3"><a href="vcl-examples.html" accesskey="U">VCL Examples</a> »</li> <li class="nav-item nav-item-this"><a href="">Manipulating request headers in VCL</a></li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="manipulating-request-headers-in-vcl"> <h1>Manipulating request headers in VCL<a class="headerlink" href="#manipulating-request-headers-in-vcl" title="Permalink to this headline">ΒΆ</a></h1> <p>Lets say we want to remove the cookie for all objects in the <cite>/images</cite> directory of our web server:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">sub</span> <span class="n">vcl_recv</span> <span class="p">{</span> <span class="k">if</span> <span class="p">(</span><span class="n">req</span><span class="o">.</span><span class="n">url</span> <span class="o">~</span> <span class="s2">"^/images"</span><span class="p">)</span> <span class="p">{</span> <span class="n">unset</span> <span class="n">req</span><span class="o">.</span><span class="n">http</span><span class="o">.</span><span class="n">cookie</span><span class="p">;</span> <span class="p">}</span> <span class="p">}</span> </pre></div> </div> <p>Now, when the request is handled to the backend server there will be no cookie header. The interesting line is the one with the if-statement. It matches the URL, taken from the request object, and matches it against the regular expression. Note the match operator. If it matches the Cookie: header of the request is unset (deleted).</p> </div> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="vcl-examples.html" title="previous chapter">VCL Examples</a></p> <h4>Next topic</h4> <p class="topless"><a href="vcl-example-manipulating-responses.html" title="next chapter">Altering the backend response</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/users-guide/vcl-example-manipulating-headers.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3 id="searchlabel">Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" aria-labelledby="searchlabel" /> <input type="submit" value="Go" /> </form> </div> </div> <script>$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="vcl-example-manipulating-responses.html" title="Altering the backend response" >next</a> |</li> <li class="right" > <a href="vcl-examples.html" title="VCL Examples" >previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 7.1.1 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Users Guide</a> »</li> <li class="nav-item nav-item-2"><a href="vcl.html" >VCL - Varnish Configuration Language</a> »</li> <li class="nav-item nav-item-3"><a href="vcl-examples.html" >VCL Examples</a> »</li> <li class="nav-item nav-item-this"><a href="">Manipulating request headers in VCL</a></li> </ul> </div> <div class="footer" role="contentinfo"> © Copyright 2010-2014, Varnish Software AS. 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