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379 lines
26 KiB
XML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
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<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
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<title>Mapping URLs to Filesystem Locations - Apache HTTP Server Version 2.5</title>
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<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="./style/css/prettify.css" />
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<script src="./style/scripts/prettify.min.js" type="text/javascript">
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</script>
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<link href="./images/favicon.ico" rel="shortcut icon" /></head>
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<body id="manual-page"><div id="page-header">
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<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="./images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.5</a></div><div id="page-content"><div id="preamble"><h1>Mapping URLs to Filesystem Locations</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="./en/urlmapping.html" title="English"> en </a> |
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<a href="./fr/urlmapping.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
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<a href="./ja/urlmapping.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="./ko/urlmapping.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
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<a href="./tr/urlmapping.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
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</div>
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<p>This document explains how the Apache HTTP Server uses the URL of a request
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to determine the filesystem location from which to serve a
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file.</p>
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</div>
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<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#related">Related Modules and Directives</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#documentroot">DocumentRoot</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#outside">Files Outside the DocumentRoot</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#user">User Directories</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#redirect">URL Redirection</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#proxy">Reverse Proxy</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#rewrite">Rewriting Engine</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#notfound">File Not Found</a></li>
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<li><img alt="" src="./images/down.gif" /> <a href="#other">Other URL Mapping Modules</a></li>
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</ul><h3>See also</h3><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="related" id="related">Related Modules and Directives</a> <a title="Permanent link" href="#related" class="permalink">¶</a></h2>
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<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_actions.html">mod_actions</a></code></li><li><code class="module"><a href="./mod/mod_alias.html">mod_alias</a></code></li><li><code class="module"><a href="./mod/mod_autoindex.html">mod_autoindex</a></code></li><li><code class="module"><a href="./mod/mod_dir.html">mod_dir</a></code></li><li><code class="module"><a href="./mod/mod_imagemap.html">mod_imagemap</a></code></li><li><code class="module"><a href="./mod/mod_negotiation.html">mod_negotiation</a></code></li><li><code class="module"><a href="./mod/mod_proxy.html">mod_proxy</a></code></li><li><code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code></li><li><code class="module"><a href="./mod/mod_speling.html">mod_speling</a></code></li><li><code class="module"><a href="./mod/mod_userdir.html">mod_userdir</a></code></li><li><code class="module"><a href="./mod/mod_vhost_alias.html">mod_vhost_alias</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/mod_alias.html#alias">Alias</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#aliasmatch">AliasMatch</a></code></li><li><code class="directive"><a href="./mod/mod_speling.html#checkspelling">CheckSpelling</a></code></li><li><code class="directive"><a href="./mod/mod_dir.html#directoryindex">DirectoryIndex</a></code></li><li><code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code></li><li><code class="directive"><a href="./mod/core.html#errordocument">ErrorDocument</a></code></li><li><code class="directive"><a href="./mod/core.html#options">Options</a></code></li><li><code class="directive"><a href="./mod/mod_proxy.html#proxypass">ProxyPass</a></code></li><li><code class="directive"><a href="./mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code></li><li><code class="directive"><a href="./mod/mod_proxy.html#proxypassreversecookiedomain">ProxyPassReverseCookieDomain</a></code></li><li><code class="directive"><a href="./mod/mod_proxy.html#proxypassreversecookiepath">ProxyPassReverseCookiePath</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#redirect">Redirect</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#redirectmatch">RedirectMatch</a></code></li><li><code class="directive"><a href="./mod/mod_rewrite.html#rewritecond">RewriteCond</a></code></li><li><code class="directive"><a href="./mod/mod_rewrite.html#rewriterule">RewriteRule</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#scriptalias">ScriptAlias</a></code></li><li><code class="directive"><a href="./mod/mod_alias.html#scriptaliasmatch">ScriptAliasMatch</a></code></li><li><code class="directive"><a href="./mod/mod_userdir.html#userdir">UserDir</a></code></li></ul></td></tr></table>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="documentroot" id="documentroot">DocumentRoot</a> <a title="Permanent link" href="#documentroot" class="permalink">¶</a></h2>
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<p>In deciding what file to serve for a given request, httpd's
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default behavior is to take the URL-Path for the request (the part
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of the URL following the hostname and port) and add it to the end
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of the <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code> specified
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in your configuration files. Therefore, the files and directories
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underneath the <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code>
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make up the basic document tree which will be visible from the
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web.</p>
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<p>For example, if <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code>
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were set to <code>/var/www/html</code> then a request for
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<code>http://www.example.com/fish/guppies.html</code> would result
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in the file <code>/var/www/html/fish/guppies.html</code> being
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served to the requesting client.</p>
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<p>If a directory is requested (i.e. a path ending with
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<code>/</code>), the file served from that directory is defined by
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the <code class="directive"><a href="./mod/mod_dir.html#directoryindex">DirectoryIndex</a></code> directive.
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For example, if <code>DocumentRoot</code> were set as above, and
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you were to set:</p>
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<div class="example"><p><code>DirectoryIndex index.html index.php</code></p></div>
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<p>Then a request for <code>http://www.example.com/fish/</code> will
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cause httpd to attempt to serve the file
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<code>/var/www/html/fish/index.html</code>. In the event that
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that file does not exist, it will next attempt to serve the file
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<code>/var/www/html/fish/index.php</code>.</p>
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<p>If neither of these files existed, the next step is to
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attempt to provide a directory index, if
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<code class="module"><a href="./mod/mod_autoindex.html">mod_autoindex</a></code> is loaded and configured to permit
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that.</p>
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<p>httpd is also capable of <a href="vhosts/">Virtual
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Hosting</a>, where the server receives requests for more than one
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host. In this case, a different <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code> can be specified for each
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virtual host, or alternatively, the directives provided by the
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module <code class="module"><a href="./mod/mod_vhost_alias.html">mod_vhost_alias</a></code> can
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be used to dynamically determine the appropriate place from which
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to serve content based on the requested IP address or
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hostname.</p>
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<p>The <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code> directive
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is set in your main server configuration file
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(<code>httpd.conf</code>) and, possibly, once per additional <a href="vhosts/">Virtual Host</a> you create.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="outside" id="outside">Files Outside the DocumentRoot</a> <a title="Permanent link" href="#outside" class="permalink">¶</a></h2>
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<p>There are frequently circumstances where it is necessary to
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allow web access to parts of the filesystem that are not strictly
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underneath the <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code>. httpd offers several
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different ways to accomplish this. On Unix systems, symbolic links
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can bring other parts of the filesystem under the <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code>. For security reasons,
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httpd will follow symbolic links only if the <code class="directive"><a href="./mod/core.html#options">Options</a></code> setting for the relevant
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directory includes <code>FollowSymLinks</code> or
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<code>SymLinksIfOwnerMatch</code>.</p>
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<p>Alternatively, the <code class="directive"><a href="./mod/mod_alias.html#alias">Alias</a></code> directive will map any part
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of the filesystem into the web space. For example, with</p>
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<pre class="prettyprint lang-config">Alias "/docs" "/var/web"</pre>
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<p>the URL <code>http://www.example.com/docs/dir/file.html</code>
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will be served from <code>/var/web/dir/file.html</code>. The
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<code class="directive"><a href="./mod/mod_alias.html#scriptalias">ScriptAlias</a></code> directive
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works the same way, with the additional effect that all content
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located at the target path is treated as <a class="glossarylink" href="./glossary.html#cgi" title="see glossary">CGI</a> scripts.</p>
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<p>For situations where you require additional flexibility, you
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can use the <code class="directive"><a href="./mod/mod_alias.html#aliasmatch">AliasMatch</a></code>
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and <code class="directive"><a href="./mod/mod_alias.html#scriptaliasmatch">ScriptAliasMatch</a></code>
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directives to do powerful <a class="glossarylink" href="./glossary.html#regex" title="see glossary">regular
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expression</a> based matching and substitution. For
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example,</p>
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<pre class="prettyprint lang-config">ScriptAliasMatch "^/~([a-zA-Z0-9]+)/cgi-bin/(.+)" "/home/$1/cgi-bin/$2"</pre>
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<p>will map a request to
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<code>http://example.com/~user/cgi-bin/script.cgi</code> to the
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path <code>/home/user/cgi-bin/script.cgi</code> and will treat
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the resulting file as a CGI script.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="user" id="user">User Directories</a> <a title="Permanent link" href="#user" class="permalink">¶</a></h2>
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<p>Traditionally on Unix systems, the home directory of a
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particular <em>user</em> can be referred to as
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<code>~user/</code>. The module <code class="module"><a href="./mod/mod_userdir.html">mod_userdir</a></code>
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extends this idea to the web by allowing files under each user's
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home directory to be accessed using URLs such as the
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following.</p>
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<div class="example"><p><code>http://www.example.com/~user/file.html</code></p></div>
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<p>For security reasons, it is inappropriate to give direct
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access to a user's home directory from the web. Therefore, the
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<code class="directive"><a href="./mod/mod_userdir.html#userdir">UserDir</a></code> directive
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specifies a directory underneath the user's home directory
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where web files are located. Using the default setting of
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<code>Userdir public_html</code>, the above URL maps to a file
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at a directory like
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<code>/home/user/public_html/file.html</code> where
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<code>/home/user/</code> is the user's home directory as
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specified in <code>/etc/passwd</code>.</p>
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<p>There are also several other forms of the
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<code>Userdir</code> directive which you can use on systems
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where <code>/etc/passwd</code> does not contain the location of
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the home directory.</p>
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<p>Some people find the "~" symbol (which is often encoded on the
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web as <code>%7e</code>) to be awkward and prefer to use an
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alternate string to represent user directories. This functionality
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is not supported by mod_userdir. However, if users' home
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directories are structured in a regular way, then it is possible
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to use the <code class="directive"><a href="./mod/mod_alias.html#aliasmatch">AliasMatch</a></code>
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directive to achieve the desired effect. For example, to make
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<code>http://www.example.com/upages/user/file.html</code> map to
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<code>/home/user/public_html/file.html</code>, use the following
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<code>AliasMatch</code> directive:</p>
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<pre class="prettyprint lang-config">AliasMatch "^/upages/([a-zA-Z0-9]+)(/(.*))?$" "/home/$1/public_html/$3"</pre>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="redirect" id="redirect">URL Redirection</a> <a title="Permanent link" href="#redirect" class="permalink">¶</a></h2>
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<p>The configuration directives discussed in the above sections
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tell httpd to get content from a specific place in the filesystem
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and return it to the client. Sometimes, it is desirable instead to
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inform the client that the requested content is located at a
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different URL, and instruct the client to make a new request with
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the new URL. This is called <em>redirection</em> and is
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implemented by the <code class="directive"><a href="./mod/mod_alias.html#redirect">Redirect</a></code> directive. For example, if
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the contents of the directory <code>/foo/</code> under the
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<code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code> are moved
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to the new directory <code>/bar/</code>, you can instruct clients
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to request the content at the new location as follows:</p>
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<pre class="prettyprint lang-config">Redirect permanent "/foo/" "http://www.example.com/bar/"</pre>
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<p>This will redirect any URL-Path starting in
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<code>/foo/</code> to the same URL path on the
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<code>www.example.com</code> server with <code>/bar/</code>
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substituted for <code>/foo/</code>. You can redirect clients to
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any server, not only the origin server.</p>
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<p>httpd also provides a <code class="directive"><a href="./mod/mod_alias.html#redirectmatch">RedirectMatch</a></code> directive for more
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complicated rewriting problems. For example, to redirect requests
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for the site home page to a different site, but leave all other
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requests alone, use the following configuration:</p>
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<pre class="prettyprint lang-config">RedirectMatch permanent "^/$" "http://www.example.com/startpage.html"</pre>
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<p>Alternatively, to temporarily redirect all pages on one site
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to a particular page on another site, use the following:</p>
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<pre class="prettyprint lang-config">RedirectMatch temp ".*" "http://othersite.example.com/startpage.html"</pre>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="proxy" id="proxy">Reverse Proxy</a> <a title="Permanent link" href="#proxy" class="permalink">¶</a></h2>
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<p>httpd also allows you to bring remote documents into the URL space
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of the local server. This technique is called <em>reverse
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proxying</em> because the web server acts like a proxy server by
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fetching the documents from a remote server and returning them to the
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client. It is different from normal (forward) proxying because, to the client,
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it appears the documents originate at the reverse proxy server.</p>
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<p>In the following example, when clients request documents under the
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<code>/foo/</code> directory, the server fetches those documents from
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the <code>/bar/</code> directory on <code>internal.example.com</code>
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and returns them to the client as if they were from the local
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server.</p>
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<pre class="prettyprint lang-config">ProxyPass "/foo/" "http://internal.example.com/bar/"
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ProxyPassReverse "/foo/" "http://internal.example.com/bar/"
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ProxyPassReverseCookieDomain internal.example.com public.example.com
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ProxyPassReverseCookiePath "/foo/" "/bar/"</pre>
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<p>The <code class="directive"><a href="./mod/mod_proxy.html#proxypass">ProxyPass</a></code> configures
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the server to fetch the appropriate documents, while the
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<code class="directive"><a href="./mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code>
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directive rewrites redirects originating at
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<code>internal.example.com</code> so that they target the appropriate
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directory on the local server. Similarly, the
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<code class="directive"><a href="./mod/mod_proxy.html#proxypassreversecookiedomain">ProxyPassReverseCookieDomain</a></code>
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and <code class="directive"><a href="./mod/mod_proxy.html#proxypassreversecookiepath">ProxyPassReverseCookiePath</a></code>
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rewrite cookies set by the backend server.</p>
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<p>It is important to note, however, that
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links inside the documents will not be rewritten. So any absolute
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links on <code>internal.example.com</code> will result in the client
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breaking out of the proxy server and requesting directly from
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<code>internal.example.com</code>. You can modify these links (and other
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content) in a page as it is being served to the client using
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<code class="module"><a href="./mod/mod_substitute.html">mod_substitute</a></code>.</p>
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<pre class="prettyprint lang-config">Substitute s/internal\.example\.com/www.example.com/i</pre>
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<p>For more sophisticated rewriting of links in HTML and XHTML, the
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<code class="module"><a href="./mod/mod_proxy_html.html">mod_proxy_html</a></code> module is also available. It allows you
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to create maps of URLs that need to be rewritten, so that complex
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proxying scenarios can be handled.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="rewrite" id="rewrite">Rewriting Engine</a> <a title="Permanent link" href="#rewrite" class="permalink">¶</a></h2>
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<p>When even more powerful substitution is required, the rewriting
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engine provided by <code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code>
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can be useful. The directives provided by this module can use
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characteristics of the request such as browser type or source IP
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address in deciding from where to serve content. In addition,
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mod_rewrite can use external database files or programs to
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determine how to handle a request. The rewriting engine is capable
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of performing all three types of mappings discussed above:
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internal redirects (aliases), external redirects, and proxying.
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Many practical examples employing mod_rewrite are discussed in the
|
|
<a href="rewrite/">detailed mod_rewrite documentation</a>.</p>
|
|
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
|
|
<div class="section">
|
|
<h2><a name="notfound" id="notfound">File Not Found</a> <a title="Permanent link" href="#notfound" class="permalink">¶</a></h2>
|
|
|
|
<p>Inevitably, URLs will be requested for which no matching
|
|
file can be found in the filesystem. This can happen for
|
|
several reasons. In some cases, it can be a result of moving
|
|
documents from one location to another. In this case, it is
|
|
best to use <a href="#redirect">URL redirection</a> to inform
|
|
clients of the new location of the resource. In this way, you
|
|
can assure that old bookmarks and links will continue to work,
|
|
even though the resource is at a new location.</p>
|
|
|
|
<p>Another common cause of "File Not Found" errors is
|
|
accidental mistyping of URLs, either directly in the browser,
|
|
or in HTML links. httpd provides the module
|
|
<code class="module"><a href="./mod/mod_speling.html">mod_speling</a></code> (sic) to help with
|
|
this problem. When this module is activated, it will intercept
|
|
"File Not Found" errors and look for a resource with a similar
|
|
filename. If one such file is found, mod_speling will send an
|
|
HTTP redirect to the client informing it of the correct
|
|
location. If several "close" files are found, a list of
|
|
available alternatives will be presented to the client.</p>
|
|
|
|
<p>An especially useful feature of mod_speling, is that it will
|
|
compare filenames without respect to case. This can help
|
|
systems where users are unaware of the case-sensitive nature of
|
|
URLs and the unix filesystem. But using mod_speling for
|
|
anything more than the occasional URL correction can place
|
|
additional load on the server, since each "incorrect" request
|
|
is followed by a URL redirection and a new request from the
|
|
client.</p>
|
|
|
|
<p><code class="module"><a href="./mod/mod_dir.html">mod_dir</a></code> provides <code class="directive"><a href="./mod/mod_dir.html#fallbackresource">FallbackResource</a></code>, which can be used to map virtual
|
|
URIs to a real resource, which then serves them. This is a very
|
|
useful replacement for <code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code> when implementing
|
|
a 'front controller'</p>
|
|
|
|
<p>If all attempts to locate the content fail, httpd returns
|
|
an error page with HTTP status code 404 (file not found). The
|
|
appearance of this page is controlled with the
|
|
<code class="directive"><a href="./mod/core.html#errordocument">ErrorDocument</a></code> directive
|
|
and can be customized in a flexible manner as discussed in the
|
|
<a href="custom-error.html">Custom error responses</a>
|
|
document.</p>
|
|
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
|
|
<div class="section">
|
|
<h2><a name="other" id="other">Other URL Mapping Modules</a> <a title="Permanent link" href="#other" class="permalink">¶</a></h2>
|
|
|
|
|
|
|
|
<p>Other modules available for URL mapping include:</p>
|
|
|
|
<ul>
|
|
<li><code class="module"><a href="./mod/mod_actions.html">mod_actions</a></code> - Maps a request to a CGI script
|
|
based on the request method, or resource MIME type.</li>
|
|
<li><code class="module"><a href="./mod/mod_dir.html">mod_dir</a></code> - Provides basic mapping of a trailing
|
|
slash into an index file such as <code>index.html</code>.</li>
|
|
<li><code class="module"><a href="./mod/mod_imagemap.html">mod_imagemap</a></code> - Maps a request to a URL based
|
|
on where a user clicks on an image embedded in a HTML document.</li>
|
|
<li><code class="module"><a href="./mod/mod_negotiation.html">mod_negotiation</a></code> - Selects an appropriate
|
|
document based on client preferences such as language or content
|
|
compression.</li>
|
|
</ul>
|
|
|
|
</div></div>
|
|
<div class="bottomlang">
|
|
<p><span>Available Languages: </span><a href="./en/urlmapping.html" title="English"> en </a> |
|
|
<a href="./fr/urlmapping.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
|
|
<a href="./ja/urlmapping.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
|
|
<a href="./ko/urlmapping.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
|
|
<a href="./tr/urlmapping.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
|
|
</div><div class="top"><a href="#page-header"><img src="./images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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