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| <title>How Directory, Location and Files sections work</title> |
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| <h1 align="CENTER">How Directory, Location and Files sections |
| work</h1> |
| |
| <p>The sections <a |
| href="mod/core.html#directory"><code><Directory></code></a>, |
| <a |
| href="mod/core.html#location"><code><Location></code></a> |
| and <a |
| href="mod/core.html#files"><code><Files></code></a> can |
| contain directives which only apply to specified directories, |
| URLs or files respectively. Also htaccess files can be used |
| inside a directory to apply directives to that directory. This |
| document explains how these different sections differ and how |
| they relate to each other when Apache decides which directives |
| apply for a particular directory or request URL.</p> |
| |
| <h2>Directives allowed in the sections</h2> |
| |
| <p>Everything that is syntactically allowed in |
| <code><Directory></code> is also allowed in |
| <code><Location></code> (except a |
| sub-<code><Files></code> section). Semantically, however |
| some things, most notably <code>AllowOverride</code> and the |
| two options <code>FollowSymLinks</code> and |
| <code>SymLinksIfOwnerMatch</code>, make no sense in |
| <code><Location></code>, |
| <code><LocationMatch></code> or |
| <code><DirectoryMatch></code>. The same for |
| <code><Files></code> -- syntactically everything is fine, |
| but semantically some things are different.</p> |
| |
| <h2>How the sections are merged</h2> |
| |
| <p>The order of merging is:</p> |
| |
| <ol> |
| <li><code><Directory></code> (except regular |
| expressions) and .htaccess done simultaneously (with |
| .htaccess, if allowed, overriding |
| <code><Directory></code>)</li> |
| |
| <li><code><DirectoryMatch></code>, and |
| <code><Directory></code> with regular expressions</li> |
| |
| <li><code><Files></code> and |
| <code><FilesMatch></code> done simultaneously</li> |
| |
| <li><code><Location></code> and |
| <code><LocationMatch></code> done simultaneously</li> |
| </ol> |
| |
| <p>Apart from <code><Directory></code>, each group is |
| processed in the order that they appear in the configuration |
| files. <code><Directory></code> (group 1 above) is |
| processed in the order shortest directory component to longest. |
| If multiple <code><Directory></code> sections apply to |
| the same directory they they are processed in the configuration |
| file order. The configuration files are read in the order |
| httpd.conf, srm.conf and access.conf. Configurations included |
| via the <code>Include</code> directive will be treated as if |
| they were inside the including file at the location of the |
| <code>Include</code> directive.</p> |
| |
| <p>Sections inside <code><VirtualHost></code> sections |
| are applied <em>after</em> the corresponding sections outside |
| the virtual host definition. This allows virtual hosts to |
| override the main server configuration.</p> |
| |
| <p>Later sections override earlier ones.</p> |
| |
| <h2>Notes about using sections</h2> |
| |
| <p>The general guidelines are:</p> |
| |
| <ul> |
| <li>If you are attempting to match objects at the filesystem |
| level then you must use <code><Directory></code> and/or |
| <code><Files></code>.</li> |
| |
| <li>If you are attempting to match objects at the URL level |
| then you must use <code><Location></code></li> |
| </ul> |
| |
| <p>But a notable exception is:</p> |
| |
| <ul> |
| <li>proxy control is done via <code><Directory></code>. |
| This is a legacy mistake because the proxy existed prior to |
| <code><Location></code>. A future version of the config |
| language should probably switch this to |
| <code><Location></code>.</li> |
| </ul> |
| |
| <p>Note about .htaccess parsing:</p> |
| |
| <ul> |
| <li>Modifying .htaccess parsing during Location doesn't do |
| anything because .htaccess parsing has already occurred.</li> |
| </ul> |
| |
| <p><code><Location></code> and symbolic links:</p> |
| |
| <ul> |
| <li>It is not possible to use "<code>Options |
| FollowSymLinks</code>" or "<code>Options |
| SymLinksIfOwnerMatch</code>" inside a |
| <code><Location></code>, |
| <code><LocationMatch></code> or |
| <code><DirectoryMatch></code> section (the options are |
| simply ignored). Using the options in question is only |
| possible inside a <code><Directory></code> section (or |
| a <code>.htaccess</code> file).</li> |
| </ul> |
| |
| <p><code><Files></code> and <code>Options</code>:</p> |
| |
| <ul> |
| <li>Apache won't check for it, but using an |
| <code>Options</code> directive inside a |
| <code><Files></code> section has no effect.</li> |
| </ul> |
| |
| <p>Another note:</p> |
| |
| <ul> |
| <li>There is actually a |
| <code><Location></code>/<code><LocationMatch></code> |
| sequence performed just before the name translation phase |
| (where <code>Aliases</code> and <code>DocumentRoots</code> |
| are used to map URLs to filenames). The results of this |
| sequence are completely thrown away after the translation has |
| completed.</li> |
| </ul> |
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