2 <!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
3 <?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
4 <!-- $LastChangedRevision$ -->
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14 http://www.apache.org/licenses/LICENSE-2.0
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23 <modulesynopsis metafile="mod_dir.xml.meta">
25 <description>Provides for "trailing slash" redirects and
26 serving directory index files</description>
28 <sourcefile>mod_dir.c</sourcefile>
29 <identifier>dir_module</identifier>
32 <p>The index of a directory can come from one of two sources:</p>
35 <li>A file written by the user, typically called
36 <code>index.html</code>. The <directive module="mod_dir"
37 >DirectoryIndex</directive> directive sets the
38 name of this file. This is controlled by
39 <module>mod_dir</module>.</li>
41 <li>Otherwise, a listing generated by the server. This is
42 provided by <module>mod_autoindex</module>.</li>
44 <p>The two functions are separated so that you can completely
45 remove (or replace) automatic index generation should you want
48 <p>A "trailing slash" redirect is issued when the server
49 receives a request for a URL
50 <code>http://servername/foo/dirname</code> where
51 <code>dirname</code> is a directory. Directories require a
52 trailing slash, so <module>mod_dir</module> issues a redirect to
53 <code>http://servername/foo/dirname/</code>.</p>
57 <name>DirectoryIndex</name>
58 <description>List of resources to look for when the client requests
59 a directory</description>
60 <syntax>DirectoryIndex
61 disabled | <var>local-url</var> [<var>local-url</var>] ...</syntax>
62 <default>DirectoryIndex index.html</default>
63 <contextlist><context>server config</context><context>virtual host</context>
64 <context>directory</context><context>.htaccess</context></contextlist>
65 <override>Indexes</override>
68 <p>The <directive>DirectoryIndex</directive> directive sets the
69 list of resources to look for, when the client requests an index
70 of the directory by specifying a / at the end of the directory
71 name. <var>Local-url</var> is the (%-encoded) URL of a document on
72 the server relative to the requested directory; it is usually the
73 name of a file in the directory. Several URLs may be given, in
74 which case the server will return the first one that it finds. If
75 none of the resources exist and the <code>Indexes</code> option is
76 set, the server will generate its own listing of the
79 <example><title>Example</title>
80 DirectoryIndex index.html
83 <p>then a request for <code>http://myserver/docs/</code> would
84 return <code>http://myserver/docs/index.html</code> if it
85 exists, or would list the directory if it did not.</p>
87 <p>Note that the documents do not need to be relative to the
91 DirectoryIndex index.html index.txt /cgi-bin/index.pl
94 <p>would cause the CGI script <code>/cgi-bin/index.pl</code> to be
95 executed if neither <code>index.html</code> or <code>index.txt</code>
96 existed in a directory.</p>
98 <p>A single argument of "disabled" prevents <module>mod_dir</module> from
99 searching for an index. An argument of "disabled" will be interpeted
100 literally if it has any arguments before or after it, even if they are "disabled"
107 <name>DirectorySlash</name>
108 <description>Toggle trailing slash redirects on or off</description>
109 <syntax>DirectorySlash On|Off</syntax>
110 <default>DirectorySlash On</default>
111 <contextlist><context>server config</context><context>virtual host</context>
112 <context>directory</context><context>.htaccess</context></contextlist>
113 <override>Indexes</override>
114 <compatibility>Available in version 2.0.51 and later</compatibility>
117 <p>The <directive>DirectorySlash</directive> directive determines, whether
118 <module>mod_dir</module> should fixup URLs pointing to a directory or
121 <p>Typically if a user requests a resource without a trailing slash, which
122 points to a directory, <module>mod_dir</module> redirects him to the same
123 resource, but <em>with</em> trailing slash for some good reasons:</p>
126 <li>The user is finally requesting the canonical URL of the resource</li>
127 <li><module>mod_autoindex</module> works correctly. Since it doesn't emit
128 the path in the link, it would point to the wrong path.</li>
129 <li><directive module="mod_dir">DirectoryIndex</directive> will be evaluated
130 <em>only</em> for directories requested with trailing slash.</li>
131 <li>Relative URL references inside html pages will work correctly.</li>
134 <p>Well, if you don't want this effect <em>and</em> the reasons above don't
135 apply to you, you can turn off the redirect with:</p>
138 # see security warning below!<br />
139 <Location /some/path><br />
141 DirectorySlash Off<br />
142 SetHandler some-handler<br />
147 <note type="warning"><title>Security Warning</title>
148 <p>Turning off the trailing slash redirect may result in an information
149 disclosure. Consider a situation where <module>mod_autoindex</module> is
150 active (<code>Options +Indexes</code>) and <directive module="mod_dir"
151 >DirectoryIndex</directive> is set to a valid resource (say,
152 <code>index.html</code>) and there's no other special handler defined for
153 that URL. In this case a request with a trailing slash would show the
154 <code>index.html</code> file. <strong>But a request without trailing slash
155 would list the directory contents</strong>.</p>
160 <name>Fallback</name>
161 <description>Define a default URL for requests that don't map to a file</description>
162 <syntax>Fallback <var>local-url</var></syntax>
163 <default>None - httpd will return 404 (Not Found)</default>
164 <contextlist><context>server config</context><context>virtual host</context>
165 <context>directory</context><context>.htaccess</context></contextlist>
166 <override>Indexes</override>
168 <p>Use this to set a handler for any URL that doesn't map to anything
169 in your filesystem, and would otherwise return HTTP 404 (Not Found).
172 <code>Fallback not-404.php</code>
174 <p>will cause requests for non-existent files to be handled by
175 <code>not-404.php</code>, while requests for files that exist