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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>2.3 Sequencing</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.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,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Web Server:<span class="mywbr"> </span> HTTP Server</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="dispatch-server-unit.html" class="tocviewlink" data-pltdoc="x">Dispatching Server</a></td></tr><tr><td align="right">2 </td><td><a href="dispatchers.html" class="tocviewselflink" data-pltdoc="x">Dispatchers</a></td></tr><tr><td align="right">3 </td><td><a href="web-server.html" class="tocviewlink" data-pltdoc="x">Launching Servers</a></td></tr><tr><td align="right">4 </td><td><a href="Web_Servers.html" class="tocviewlink" data-pltdoc="x">Web Servers</a></td></tr><tr><td align="right">5 </td><td><a href="private.html" class="tocviewlink" data-pltdoc="x">Internal APIs</a></td></tr><tr><td align="right">6 </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 class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>2 </td><td><a href="dispatchers.html" class="tocviewlink" data-pltdoc="x">Dispatchers</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">2.1 </td><td><a href="dispatch.html" class="tocviewlink" data-pltdoc="x">General</a></td></tr><tr><td align="right">2.2 </td><td><a href="filesystem-map.html" class="tocviewlink" data-pltdoc="x">Mapping URLs to Paths</a></td></tr><tr><td align="right">2.3 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Sequencing</a></td></tr><tr><td align="right">2.4 </td><td><a href="dispatch-timeout.html" class="tocviewlink" data-pltdoc="x">Timeouts</a></td></tr><tr><td align="right">2.5 </td><td><a href="dispatch-lift.html" class="tocviewlink" data-pltdoc="x">Lifting Procedures</a></td></tr><tr><td align="right">2.6 </td><td><a href="dispatch-filter.html" class="tocviewlink" data-pltdoc="x">Filtering Requests</a></td></tr><tr><td align="right">2.7 </td><td><a href="dispatch-pathprocedure.html" class="tocviewlink" data-pltdoc="x">Procedure Invocation upon Request</a></td></tr><tr><td align="right">2.8 </td><td><a href="dispatch-log.html" class="tocviewlink" data-pltdoc="x">Logging</a></td></tr><tr><td align="right">2.9 </td><td><a href="dispatch-passwords.html" class="tocviewlink" data-pltdoc="x">Password Protection</a></td></tr><tr><td align="right">2.10 </td><td><a href="dispatch-host.html" class="tocviewlink" data-pltdoc="x">Virtual Hosts</a></td></tr><tr><td align="right">2.11 </td><td><a href="dispatch-files.html" class="tocviewlink" data-pltdoc="x">Serving Files</a></td></tr><tr><td align="right">2.12 </td><td><a href="dispatch-servlets.html" class="tocviewlink" data-pltdoc="x">Serving Servlets</a></td></tr><tr><td align="right">2.13 </td><td><a href="dispatch-stat.html" class="tocviewlink" data-pltdoc="x">Statistics</a></td></tr><tr><td align="right">2.14 </td><td><a href="limit.html" class="tocviewlink" data-pltdoc="x">Limiting Requests</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Fdispatch-sequencer..rkt%29._make%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">make</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><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, "6.7", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">top</a></span><span class="navright"> <a href="filesystem-map.html" title="backward to "2.2 Mapping URLs to Paths"" data-pltdoc="x">← prev</a> <a href="dispatchers.html" title="up to "2 Dispatchers"" data-pltdoc="x">up</a> <a href="dispatch-timeout.html" title="forward to "2.4 Timeouts"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "web-server/scribblings/web-server-internal.scrbl")" x-source-pkg="web-server-doc" x-part-tag=""dispatch-sequencer"">2.3<tt> </tt><a name="(part._dispatch-sequencer)"></a><a name="(mod-path._web-server/dispatchers/dispatch-sequencer)"></a>Sequencing</h4><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left" colspan="2"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">web-server/dispatchers/dispatch-sequencer</span></a><span class="RktPn">)</span></td></tr><tr><td align="left"> </td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">web-server-lib</span></span></td></tr></table></div><div class="SIntrapara">The <a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">web-server/dispatchers/dispatch-sequencer</span></a> module defines a dispatcher constructor
that invokes a sequence of dispatchers until one applies.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._web-server/dispatchers/dispatch-sequencer..rkt)._make))"></a><span title="Provided from: web-server/dispatchers/dispatch-sequencer | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Fdispatch-sequencer..rkt%29._make%29%29" class="RktValDef RktValLink" data-pltdoc="x">make</a></span></span><span class="hspace"> </span><span class="RktVar">dispatcher</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="dispatch.html#%28def._%28%28lib._web-server%2Fdispatchers%2Fdispatch..rkt%29._dispatcher%2Fc%29%29" class="RktValLink" data-pltdoc="x">dispatcher/c</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">dispatcher</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="dispatch.html#%28def._%28%28lib._web-server%2Fdispatchers%2Fdispatch..rkt%29._dispatcher%2Fc%29%29" class="RktValLink" data-pltdoc="x">dispatcher/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Invokes each <span class="RktVar">dispatcher</span>, invoking the next if the first
calls <span class="RktSym"><a href="dispatch.html#%28def._%28%28lib._web-server%2Fdispatchers%2Fdispatch..rkt%29._next-dispatcher%29%29" class="RktValLink" data-pltdoc="x">next-dispatcher</a></span>. If no <span class="RktVar">dispatcher</span> applies,
then it calls <span class="RktSym"><a href="dispatch.html#%28def._%28%28lib._web-server%2Fdispatchers%2Fdispatch..rkt%29._next-dispatcher%29%29" class="RktValLink" data-pltdoc="x">next-dispatcher</a></span> itself.</div></p><div class="navsetbottom"><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, "6.7", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">top</a></span><span class="navright"> <a href="filesystem-map.html" title="backward to "2.2 Mapping URLs to Paths"" data-pltdoc="x">← prev</a> <a href="dispatchers.html" title="up to "2 Dispatchers"" data-pltdoc="x">up</a> <a href="dispatch-timeout.html" title="forward to "2.4 Timeouts"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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