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Apache Module mod_dir

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Description:Provides for "trailing slash" redirects and serving directory index files
Module Identifier:dir_module
Source File:mod_dir.c


The index of a directory can come from one of two sources:

The two functions are separated so that you can completely remove (or replace) automatic index generation should you want to.

A "trailing slash" redirect is issued when the server receives a request for a URL http://servername/foo/dirname where dirname is a directory. Directories require a trailing slash, so mod_dir issues a redirect to http://servername/foo/dirname/.



DirectoryIndex Directive

Description:List of resources to look for when the client requests a directory
Syntax:DirectoryIndex local-url [local-url] ...
Default:DirectoryIndex index.html
Context:server config, virtual host, directory, .htaccess

The DirectoryIndex directive sets the list of resources to look for, when the client requests an index of the directory by specifying a / at the end of the directory name. Local-url is the (%-encoded) URL of a document on the server relative to the requested directory; it is usually the name of a file in the directory. Several URLs may be given, in which case the server will return the first one that it finds. If none of the resources exist and the Indexes option is set, the server will generate its own listing of the directory.


DirectoryIndex index.html

then a request for http://example.com/docs/ would return http://example.com/docs/index.html if it exists, or would list the directory if it did not.

Note that the documents do not need to be relative to the directory;

DirectoryIndex index.html index.txt /cgi-bin/index.pl

would cause the CGI script /cgi-bin/index.pl to be executed if neither index.html or index.txt existed in a directory.

Note: Multiple DirectoryIndex directives within the same context will add to the list of resources to look for rather than replace:

# Example A: Set index.html as an index page, then add index.php to that list as well.
<Directory /foo>
    DirectoryIndex index.html
    DirectoryIndex index.php

# Example B: This is identical to example A, except it's done with a single directive.
<Directory /foo>
    DirectoryIndex index.html index.php

DirectorySlash Directive

Description:Toggle trailing slash redirects on or off
Syntax:DirectorySlash On|Off
Default:DirectorySlash On
Context:server config, virtual host, directory, .htaccess
Compatibility:Available in version 2.0.51 and later

The DirectorySlash directive determines whether mod_dir should fixup URLs pointing to a directory or not.

Typically if a user requests a resource without a trailing slash, which points to a directory, mod_dir redirects him to the same resource, but with trailing slash for some good reasons:

If you don't want this effect and the reasons above don't apply to you, you can turn off the redirect as shown below. However, be aware that there are possible security implications to doing this.

# see security warning below!
<Location /some/path>
DirectorySlash Off
SetHandler some-handler

Security Warning

Turning off the trailing slash redirect may result in an information disclosure. Consider a situation where mod_autoindex is active (Options +Indexes) and DirectoryIndex is set to a valid resource (say, index.html) and there's no other special handler defined for that URL. In this case a request with a trailing slash would show the index.html file. But a request without trailing slash would list the directory contents.


FallbackResource Directive

Description:Define a default URL for requests that don't map to a file
Syntax:FallbackResource disabled | local-url
Default:None - httpd will return 404 (Not Found)
Context:server config, virtual host, directory, .htaccess
Compatibility:Apache HTTP Server 2.2.16 and later - The disabled argument is supported since 2.2.24

Use this to set a handler for any URL that doesn't map to anything in your filesystem, and would otherwise return HTTP 404 (Not Found). For example

FallbackResource /not-404.php

will cause requests for non-existent files to be handled by not-404.php, while requests for files that exist are unaffected.

It is frequently desirable to have a single file or resource handle all requests to a particular directory, except those requests that correspond to an existing file or script. This is often referred to as a 'front controller.'

In earlier versions of httpd, this effect typically required mod_rewrite, and the use of the -f and -d tests for file and directory existence. This now requires only one line of configuration.

FallbackResource /index.php

Existing files, such as images, css files, and so on, will be served normally.

Use the disabled argument to disable that feature if inheritance from a parent directory is not desired.

In a sub-URI, such as http://example.com/blog/ this sub-URI has to be supplied as local-url:

<Directory /web/example.com/htdocs/blog>
FallbackResource /blog/index.php
<Directory /web/example.com/htdocs/blog/images>
FallbackResource disabled

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