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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>5.9 Miscellaneous Utilities</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="tocviewlink" 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="tocviewselflink" 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>5 </td><td><a href="private.html" class="tocviewlink" data-pltdoc="x">Internal APIs</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">5.1 </td><td><a href="timer.html" class="tocviewlink" data-pltdoc="x">Timers</a></td></tr><tr><td align="right">5.2 </td><td><a href="connection-manager.html" class="tocviewlink" data-pltdoc="x">Connection Manager</a></td></tr><tr><td align="right">5.3 </td><td><a href="closure.html" class="tocviewlink" data-pltdoc="x">Serializable Closures</a></td></tr><tr><td align="right">5.4 </td><td><a href="cache-table.html" class="tocviewlink" data-pltdoc="x">Cache Table</a></td></tr><tr><td align="right">5.5 </td><td><a href="mime-types.html" class="tocviewlink" data-pltdoc="x">MIME Types</a></td></tr><tr><td align="right">5.6 </td><td><a href="mod-map.html" class="tocviewlink" data-pltdoc="x">Serialization Utilities</a></td></tr><tr><td align="right">5.7 </td><td><a href="url-param.html" class="tocviewlink" data-pltdoc="x">URL Param</a></td></tr><tr><td align="right">5.8 </td><td><a href="gzip.html" class="tocviewlink" data-pltdoc="x">GZip</a></td></tr><tr><td align="right">5.9 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Miscellaneous Utilities</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%2Fprivate%2Futil..rkt%29._bytes-ci~3d~3f%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">bytes-<wbr></wbr>ci=?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._url-replace-path%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">url-<wbr></wbr>replace-<wbr></wbr>path</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._url-path-~3estring%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">url-<wbr></wbr>path-<wbr></wbr>>string</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._explode-path%2A%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">explode-<wbr></wbr>path*</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._path-without-base%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">path-<wbr></wbr>without-<wbr></wbr>base</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._directory-part%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">directory-<wbr></wbr>part</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._build-path-unless-absolute%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">build-<wbr></wbr>path-<wbr></wbr>unless-<wbr></wbr>absolute</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._network-error%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">network-<wbr></wbr>error</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._exn-~3estring%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">exn-<wbr></wbr>>string</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._read%2Fbytes%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">read/<span class="mywbr"> </span>bytes</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._write%2Fbytes%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">write/<span class="mywbr"> </span>bytes</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._path-piece~3f%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">path-<wbr></wbr>piece?</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="gzip.html" title="backward to "5.8 GZip"" data-pltdoc="x">← prev</a> <a href="private.html" title="up to "5 Internal APIs"" data-pltdoc="x">up</a> <a href="Troubleshooting_and_Tips.html" title="forward to "6 Troubleshooting and Tips"" 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=""misc-util"">5.9<tt> </tt><a name="(part._misc-util)"></a><a name="(mod-path._web-server/private/util)"></a>Miscellaneous Utilities</h4><p><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/private/util</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></p><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/private/util..rkt)._bytes-ci~3d~3f))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._bytes-ci~3d~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">bytes-ci=?</a></span></span><span class="hspace"> </span><span class="RktVar">b1</span><span class="hspace"> </span><span class="RktVar">b2</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=booleans.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._boolean%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">boolean?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">b1</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=bytestrings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._bytes%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">bytes?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">b2</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=bytestrings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._bytes%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">bytes?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Compares two bytes case insensitively.</div></p><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/private/util..rkt)._url-replace-path))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._url-replace-path%29%29" class="RktValDef RktValLink" data-pltdoc="x">url-replace-path</a></span></span><span class="hspace"> </span><span class="RktVar">proc</span><span class="hspace"> </span><span class="RktVar">u</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym">url?</span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">proc</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</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=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._listof%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktSym">path/param?</span><span class="RktPn">)</span><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=function-contracts.html%23%2528form._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._-%7E3e%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x"><span class="nobreak">-></span></a></span><span class="RktPn"> .</span><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=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._listof%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktSym">path/param?</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">u</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym">url?</span></td></tr></table></blockquote></div><div class="SIntrapara">Replaces the URL path of <span class="RktVar">u</span> with <span class="RktVar">proc</span> of the former path.</div></p><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/private/util..rkt)._url-path-~3estring))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._url-path-~3estring%29%29" class="RktValDef RktValLink" data-pltdoc="x">url-path->string</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="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">string?</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="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._listof%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktSym">path/param?</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Formats <span class="RktVar">url-path</span> as a string with <span class="RktVal">"/"</span> as a delimiter
and no params.</div></p><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/private/util..rkt)._explode-path*))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._explode-path%2A%29%29" class="RktValDef RktValLink" data-pltdoc="x">explode-path*</a></span></span><span class="hspace"> </span><span class="RktVar">p</span><span class="RktPn">)</span><span class="hspace"> </span>→<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=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._listof%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._path-piece~3f%29%29" class="RktValLink" data-pltdoc="x">path-piece?</a></span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">p</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/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=6.7" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=More_Path_Utilities.html%23%2528def._%2528%2528lib._racket%252Fpath..rkt%2529._normalize-path%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">normalize-path</a></span>, but does not resolve symlinks.</div></p><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/private/util..rkt)._path-without-base))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._path-without-base%29%29" class="RktValDef RktValLink" data-pltdoc="x">path-without-base</a></span></span><span class="hspace"> </span><span class="RktVar">base</span><span class="hspace"> </span><span class="RktVar">p</span><span class="RktPn">)</span><span class="hspace"> </span>→<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=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._listof%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._path-piece~3f%29%29" class="RktValLink" data-pltdoc="x">path-piece?</a></span><span class="RktPn">)</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="https://download.racket-lang.org/docs/6.7/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=6.7" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">p</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/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=6.7" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns, as a list, the portion of <span class="RktVar">p</span> after <span class="RktVar">base</span>,
assuming <span class="RktVar">base</span> is a prefix of <span class="RktVar">p</span>.</div></p><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/private/util..rkt)._directory-part))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._directory-part%29%29" class="RktValDef RktValLink" data-pltdoc="x">directory-part</a></span></span><span class="hspace"> </span><span class="RktVar">p</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=Manipulating_Paths.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._path%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">path?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">p</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/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=6.7" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns the directory part of <span class="RktVar">p</span>, returning <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=Filesystem.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._current-directory%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">current-directory</a></span><span class="RktPn">)</span>
if it is relative.</div></p><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/private/util..rkt)._build-path-unless-absolute))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._build-path-unless-absolute%29%29" class="RktValDef RktValLink" data-pltdoc="x">build-path-unless-absolute</a></span></span><span class="hspace"> </span><span class="RktVar">base</span><span class="hspace"> </span><span class="RktVar">p</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=Manipulating_Paths.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._path%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">path?</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="https://download.racket-lang.org/docs/6.7/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=6.7" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">p</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/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=6.7" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Prepends <span class="RktVar">base</span> to <span class="RktVar">p</span>, unless <span class="RktVar">p</span> is absolute.</div></p><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/private/util..rkt)._network-error))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._network-error%29%29" class="RktValDef RktValLink" data-pltdoc="x">network-error</a></span></span><span class="hspace"> </span><span class="RktVar">s</span><span class="hspace"> </span><span class="RktVar">fmt</span><span class="hspace"> </span><span class="RktVar">v</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="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">void</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">s</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=symbols.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._symbol%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">symbol?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">fmt</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">string?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">v</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._any%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=exns.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._error%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">error</a></span>, but throws a <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=exns.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._exn%7E3afail%7E3anetwork%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">exn:fail:network</a></span>.</div></p><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/private/util..rkt)._exn-~3estring))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._exn-~3estring%29%29" class="RktValDef RktValLink" data-pltdoc="x">exn->string</a></span></span><span class="hspace"> </span><span class="RktVar">exn</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">string?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">exn</span><span class="hspace"> </span>:<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=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=exns.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exn%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">exn?</a></span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._any%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">any/c</a></span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Formats <span class="RktVar">exn</span> with <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=exns.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._error-display-handler%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">error-display-handler</a></span><span class="RktPn">)</span> as a string.</div></p><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/private/util..rkt)._read/bytes))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._read%2Fbytes%29%29" class="RktValDef RktValLink" data-pltdoc="x">read/bytes</a></span></span><span class="hspace"> </span><span class="RktVar">bstr</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._printable%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">printable/c</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">bstr</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=bytestrings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._bytes%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">bytes?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Extracts a value from <span class="RktVar">bstr</span> using <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=Reading.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._read%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">read</a></span>.</div></p><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/private/util..rkt)._write/bytes))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._write%2Fbytes%29%29" class="RktValDef RktValLink" data-pltdoc="x">write/bytes</a></span></span><span class="hspace"> </span><span class="RktVar">v</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=bytestrings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._bytes%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">bytes?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">v</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._printable%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">printable/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Prints <span class="RktVar">v</span> into a byte string using <span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=Writing.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._write%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">write</a></span>.</div></p><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/private/util..rkt)._path-piece~3f))"></a><span title="Provided from: web-server/private/util | Package: web-server-lib"><span class="RktSym"><a href="#%28def._%28%28lib._web-server%2Fprivate%2Futil..rkt%29._path-piece~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">path-piece?</a></span></span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=contract-utilities.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fguts..rkt%2529._contract%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">contract?</a></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Equivalent to <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=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="stt"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/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=6.7" class="RktValLink Sq" data-pltdoc="x">path-string?</a></span><span class="stt"> </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=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._symbols%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">symbols</a></span><span class="stt"> </span><span class="RktVal">'</span><span class="RktVal">up</span><span class="stt"> </span><span class="RktVal">'</span><span class="RktVal">same</span><span class="RktPn">)</span><span class="RktPn">)</span>.</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="gzip.html" title="backward to "5.8 GZip"" data-pltdoc="x">← prev</a> <a 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