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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>Web Server: HTTP Server</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_0&quot;);">&#9660;</a></td><td></td><td><a href="" class="tocviewselflink" data-pltdoc="x">Web Server:<span class="mywbr"> &nbsp;</span> HTTP Server</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="dispatch-server-unit.html" class="tocviewlink" data-pltdoc="x">Dispatching Server</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="dispatchers.html" class="tocviewlink" data-pltdoc="x">Dispatchers</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="web-server.html" class="tocviewlink" data-pltdoc="x">Launching Servers</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="Web_Servers.html" class="tocviewlink" data-pltdoc="x">Web Servers</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="private.html" class="tocviewlink" data-pltdoc="x">Internal APIs</a></td></tr><tr><td align="right">6&nbsp;</td><td><a href="Troubleshooting_and_Tips.html" class="tocviewlink" data-pltdoc="x">Troubleshooting and Tips</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._top%29" class="tocsubseclink" data-pltdoc="x">Web Server:<span class="mywbr"> &nbsp;</span> HTTP Server</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.1</span></div><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<span class="nonavigation">&larr; prev</span>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.1&quot;);">up</a>&nbsp;&nbsp;<a href="dispatch-server-unit.html" title="forward to &quot;1 Dispatching Server&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h2 x-source-module="(lib &quot;web-server/scribblings/web-server-internal.scrbl&quot;)" x-part-tag="&quot;top&quot;"><a name="(part._top)"></a><a name="(part._web-server-ref-internal)"></a>Web Server: HTTP Server</h2><div class="SAuthorListBox"><span class="SAuthorList"><p class="author">Jay McCarthy</p></span></div><p>This manual describes the internals of the Racket Web Server.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-server-unit.html" class="toptoclink" data-pltdoc="x">1<span class="hspace">&nbsp;</span>Dispatching Server</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-server-unit.html#%28part._.Dispatching_.Server_.Signatures%29" class="toclink" data-pltdoc="x">1.1<span class="hspace">&nbsp;</span>Dispatching Server Signatures</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-server-unit.html#%28part._.Dispatching_.Server_.Unit%29" class="toclink" data-pltdoc="x">1.2<span class="hspace">&nbsp;</span>Dispatching Server Unit</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-server-unit.html#%28part._.Threads_and_.Custodians%29" class="toclink" data-pltdoc="x">1.3<span class="hspace">&nbsp;</span>Threads and Custodians</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatchers.html" class="toptoclink" data-pltdoc="x">2<span class="hspace">&nbsp;</span>Dispatchers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch.html" class="toclink" data-pltdoc="x">2.1<span class="hspace">&nbsp;</span>General</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="filesystem-map.html" class="toclink" data-pltdoc="x">2.2<span class="hspace">&nbsp;</span>Mapping URLs to Paths</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-sequencer.html" class="toclink" data-pltdoc="x">2.3<span class="hspace">&nbsp;</span>Sequencing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-timeout.html" class="toclink" data-pltdoc="x">2.4<span class="hspace">&nbsp;</span>Timeouts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-lift.html" class="toclink" data-pltdoc="x">2.5<span class="hspace">&nbsp;</span>Lifting Procedures</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-filter.html" class="toclink" data-pltdoc="x">2.6<span class="hspace">&nbsp;</span>Filtering Requests</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-pathprocedure.html" class="toclink" data-pltdoc="x">2.7<span class="hspace">&nbsp;</span>Procedure Invocation upon Request</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-log.html" class="toclink" data-pltdoc="x">2.8<span class="hspace">&nbsp;</span>Logging</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-passwords.html" class="toclink" data-pltdoc="x">2.9<span class="hspace">&nbsp;</span>Password Protection</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-host.html" class="toclink" data-pltdoc="x">2.10<span class="hspace">&nbsp;</span>Virtual Hosts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-files.html" class="toclink" data-pltdoc="x">2.11<span class="hspace">&nbsp;</span>Serving Files</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-servlets.html" class="toclink" data-pltdoc="x">2.12<span class="hspace">&nbsp;</span>Serving Servlets</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-servlets.html#%28part._setup%29" class="toclink" data-pltdoc="x">2.12.1<span class="hspace">&nbsp;</span>Setting Up Servlets</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-servlets.html#%28part._namespace%29" class="toclink" data-pltdoc="x">2.12.2<span class="hspace">&nbsp;</span>Servlet Namespaces</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-servlets.html#%28part._.Why_this_is_useful%29" class="toclink" data-pltdoc="x">2.12.2.1<span class="hspace">&nbsp;</span>Why this is useful</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-servlets.html#%28part._.Internal_.Servlet_.Representation%29" class="toclink" data-pltdoc="x">2.12.3<span class="hspace">&nbsp;</span>Internal Servlet Representation</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="dispatch-stat.html" class="toclink" data-pltdoc="x">2.13<span class="hspace">&nbsp;</span>Statistics</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="limit.html" class="toclink" data-pltdoc="x">2.14<span class="hspace">&nbsp;</span>Limiting Requests</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="web-server.html" class="toptoclink" data-pltdoc="x">3<span class="hspace">&nbsp;</span>Launching Servers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="web-server.html#%28part._.Simple_.Single_.Servlet_.Servers%29" class="toclink" data-pltdoc="x">3.1<span class="hspace">&nbsp;</span>Simple Single Servlet Servers</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html" class="toptoclink" data-pltdoc="x">4<span class="hspace">&nbsp;</span>Web Servers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._web-server-unit%29" class="toclink" data-pltdoc="x">4.1<span class="hspace">&nbsp;</span>Server Units</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._ws-sig%29" class="toclink" data-pltdoc="x">4.1.1<span class="hspace">&nbsp;</span>Signature</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._ws-unit%29" class="toclink" data-pltdoc="x">4.1.2<span class="hspace">&nbsp;</span>Unit</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._web-config._web-config-unit%29" class="toclink" data-pltdoc="x">4.2<span class="hspace">&nbsp;</span>Configuration Units</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._web-config._.Signature%29" class="toclink" data-pltdoc="x">4.2.1<span class="hspace">&nbsp;</span>Signature</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._web-config._.Unit%29" class="toclink" data-pltdoc="x">4.2.2<span class="hspace">&nbsp;</span>Unit</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._configuration-table%29" class="toclink" data-pltdoc="x">4.3<span class="hspace">&nbsp;</span>Configuration Table</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._configuration-table-structs%29" class="toclink" data-pltdoc="x">4.4<span class="hspace">&nbsp;</span>Configuration Table Structure</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Web_Servers.html#%28part._responders%29" class="toclink" data-pltdoc="x">4.5<span class="hspace">&nbsp;</span>Standard Responders</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="private.html" class="toptoclink" data-pltdoc="x">5<span class="hspace">&nbsp;</span>Internal APIs</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="timer.html" class="toclink" data-pltdoc="x">5.1<span class="hspace">&nbsp;</span>Timers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="connection-manager.html" class="toclink" data-pltdoc="x">5.2<span class="hspace">&nbsp;</span>Connection Manager</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="closure.html" class="toclink" data-pltdoc="x">5.3<span class="hspace">&nbsp;</span>Serializable Closures</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="closure.html#%28part._.Definition_.Syntax%29" class="toclink" data-pltdoc="x">5.3.1<span class="hspace">&nbsp;</span>Definition Syntax</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="cache-table.html" class="toclink" data-pltdoc="x">5.4<span class="hspace">&nbsp;</span>Cache Table</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="mime-types.html" class="toclink" data-pltdoc="x">5.5<span class="hspace">&nbsp;</span>MIME Types</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="mod-map.html" class="toclink" data-pltdoc="x">5.6<span class="hspace">&nbsp;</span>Serialization Utilities</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="url-param.html" class="toclink" data-pltdoc="x">5.7<span class="hspace">&nbsp;</span>URL Param</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="gzip.html" class="toclink" data-pltdoc="x">5.8<span class="hspace">&nbsp;</span>GZip</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="misc-util.html" class="toclink" data-pltdoc="x">5.9<span class="hspace">&nbsp;</span>Miscellaneous Utilities</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Troubleshooting_and_Tips.html" class="toptoclink" data-pltdoc="x">6<span class="hspace">&nbsp;</span>Troubleshooting and Tips</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Troubleshooting_and_Tips.html#%28part._.How_do_.I_use_.Apache_with_the_.Racket_.Web_.Server_%29" class="toclink" data-pltdoc="x">6.1<span class="hspace">&nbsp;</span>How do I use Apache with the Racket Web Server?</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Troubleshooting_and_Tips.html#%28part._.Can_the_server_create_a_.P.I.D_file_%29" class="toclink" data-pltdoc="x">6.2<span class="hspace">&nbsp;</span>Can the server create a PID file?</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Troubleshooting_and_Tips.html#%28part._faq~3ahttps%29" class="toclink" data-pltdoc="x">6.3<span class="hspace">&nbsp;</span>How do I set up the server to use HTTPS?</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="Troubleshooting_and_Tips.html#%28part._.How_do_.I_limit_the_number_of_requests_serviced_at_once_by_the_.Web_.Server_%29" class="toclink" data-pltdoc="x">6.4<span class="hspace">&nbsp;</span>How do I limit the number of requests serviced at once by the Web Server?</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="doc-index.html" class="toptoclink" data-pltdoc="x">Index</a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a 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