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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>2.2 Mapping URLs to Paths</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="" class="tocviewselflink" data-pltdoc="x">Mapping URLs to Paths</a></td></tr><tr><td align="right">2.3 </td><td><a href="dispatch-sequencer.html" class="tocviewlink" 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%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">url-<wbr></wbr>>path/<span class="mywbr"> </span>c</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._make-url-~3epath%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">make-<wbr></wbr>url-<wbr></wbr>>path</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._make-url-~3evalid-path%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">make-<wbr></wbr>url-<wbr></wbr>>valid-<wbr></wbr>path</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._filter-url-~3epath%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">filter-<wbr></wbr>url-<wbr></wbr>>path</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, "6.1", "../");" 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("6.1");">top</a></span><span class="navright"> <a href="dispatch.html" title="backward to "2.1 General"" data-pltdoc="x">← prev</a> <a href="dispatchers.html" title="up to "2 Dispatchers"" data-pltdoc="x">up</a> <a href="dispatch-sequencer.html" title="forward to "2.3 Sequencing"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "web-server/scribblings/web-server-internal.scrbl")" x-part-tag=""filesystem-map"">2.2<tt> </tt><a name="(part._filesystem-map)"></a><a name="(mod-path._web-server/dispatchers/filesystem-map)"></a>Mapping URLs to Paths</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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" 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/filesystem-map</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">This module provides a means of mapping
URLs to paths on the filesystem.</div><div class="SIntrapara"><p><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>value</p></div></div><p class="RForeground"><a name="(def._((lib._web-server/dispatchers/filesystem-map..rkt)._url-~3epath/c))"></a><span title="Provided from: web-server/dispatchers/filesystem-map | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="RktValDef RktValLink" data-pltdoc="x">url->path/c</a></span></span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=contract-utilities.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._contract%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">contract?</a></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">This contract is equivalent to <span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=function-contracts.html%23%2528form._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._-%7E3e%252A%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x"><span class="nobreak">-></span>*</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=net&rel=url.html%23%2528def._%2528%2528lib._net%252Furl-structs..rkt%2529._url%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">url?</a></span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=Manipulating_Paths.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._path%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">path?</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._listof%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="stt"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=unstable&rel=contract.html%23%2528def._%2528%2528lib._unstable%252Fcontract..rkt%2529._path-piece%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">path-piece?</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span>.
The returned <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=Manipulating_Paths.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._path%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">path?</a></span> is the path on disk. The list is the list of
path elements that correspond to the path of the URL.</div></p></div><div class="SIntrapara"><p><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/filesystem-map..rkt)._make-url-~3epath))"></a><span title="Provided from: web-server/dispatchers/filesystem-map | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._make-url-~3epath%29%29" class="RktValDef RktValLink" data-pltdoc="x">make-url->path</a></span></span><span class="hspace"> </span><span class="RktVar">base</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="RktValLink" data-pltdoc="x">url->path/c</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">base</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=Manipulating_Paths.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fmisc..rkt%2529._path-string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">The <span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="RktValLink" data-pltdoc="x">url->path/c</a></span> returned by this procedure considers the root
URL to be <span class="RktVar">base</span>. It ensures that <span class="RktVal">".."</span>s in the URL
do not escape the <span class="RktVar">base</span> and removes them silently otherwise.</div></p></div><div class="SIntrapara"><p><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/filesystem-map..rkt)._make-url-~3evalid-path))"></a><span title="Provided from: web-server/dispatchers/filesystem-map | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._make-url-~3evalid-path%29%29" class="RktValDef RktValLink" data-pltdoc="x">make-url->valid-path</a></span></span><span class="hspace"> </span><span class="RktVar">url->path</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="RktValLink" data-pltdoc="x">url->path/c</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">url->path</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="RktValLink" data-pltdoc="x">url->path/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Runs the underlying <span class="RktVar">url->path</span>, but only returns if the path
refers to a file that actually exists. If it is does not, then the suffix
elements of the URL are removed until a file is found. If this never occurs,
then an error is thrown.</div></p></div><div class="SIntrapara">This is primarily useful for dispatchers that allow path information after
the name of a service to be used for data, but where the service is represented
by a file. The most prominent example is obviously servlets.</div><div class="SIntrapara"><p><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/filesystem-map..rkt)._filter-url-~3epath))"></a><span title="Provided from: web-server/dispatchers/filesystem-map | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._filter-url-~3epath%29%29" class="RktValDef RktValLink" data-pltdoc="x">filter-url->path</a></span></span><span class="hspace"> </span><span class="RktVar">regex</span><span class="hspace"> </span><span class="RktVar">url->path</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="RktValLink" data-pltdoc="x">url->path/c</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">regex</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=regexp.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._regexp%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">regexp?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">url->path</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fdispatchers%2Ffilesystem-map..rkt%29._url-~3epath%2Fc%29%29" class="RktValLink" data-pltdoc="x">url->path/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Runs the underlying <span class="RktVar">url->path</span> but will only return if the
path, when considered as a string, matches the <span class="RktVar">regex</span>. This is
useful to disallow strange files, like GIFs, from being considered
servlets when using the servlet dispatchers. It will return a
<span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=exns.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exn%7E3afail%7E3afilesystem%7E3aexists%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">exn:fail:filesystem:exists?</a></span> exception if the path does not
match.</div></p></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, "6.1", "../");" 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("6.1");">top</a></span><span class="navright"> <a href="dispatch.html" title="backward to "2.1 General"" data-pltdoc="x">← prev</a> <a href="dispatchers.html" title="up to "2 Dispatchers"" data-pltdoc="x">up</a> <a href="dispatch-sequencer.html" title="forward to "2.3 Sequencing"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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