Apache Module mod_dir
Description: | Provides for "trailing slash" redirects and serving directory index files |
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Status: | Base |
ModuleIdentifier: | dir_module |
SourceFile: | mod_dir.c |
Summary
The index of a directory can come from one of two sources:
- A file written by the user, typically called
index.html
. TheDirectoryIndex
directive sets the name of this file. This is controlled bymod_dir
. - Otherwise, a listing generated by the server. This is provided by
mod_autoindex
.
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/
.
DirectoryCheckHandler Directive
Description: | Toggle how this module responds when another handler is configured |
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Syntax: | DirectoryCheckHandler On|Off |
Default: | DirectoryCheckHandler Off |
Context: | server config, virtual host, directory, .htaccess |
Override: | Indexes |
Status: | Base |
Module: | mod_dir |
Compatibility: | Available in 2.4.8 and later. Releases prior to 2.4 implicitly act as if "DirectoryCheckHandler ON" was specified. |
The DirectoryCheckHandler
directive determines whether mod_dir
should check for directory indexes or add trailing slashes when some other handler has been configured for the current URL. Handlers can be set by directives such as SetHandler
or by other modules, such as mod_rewrite
during per-directory substitutions.
In releases prior to 2.4, this module did not take any action if any other handler was configured for a URL. This allows directory indexes to be served even when a SetHandler
directive is specified for an entire directory, but it can also result in some conflicts with modules such as mod_rewrite
.
DirectoryIndex Directive
Description: | List of resources to look for when the client requests a directory |
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Syntax: | DirectoryIndex disabled | local-url [local-url] ... |
Default: | DirectoryIndex index.html |
Context: | server config, virtual host, directory, .htaccess |
Override: | Indexes |
Status: | Base |
Module: | mod_dir |
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.
Example
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.
A single argument of "disabled" prevents mod_dir
from searching for an index. An argument of "disabled" will be interpreted literally if it has any arguments before or after it, even if they are "disabled" as well.
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 </Directory> # Example B: This is identical to example A, except it's done with a single directive. <Directory "/foo"> DirectoryIndex index.html index.php </Directory> # Example C: To replace the list, you must explicitly reset it first: # In this example, only index.php will remain as an index resource. <Directory "/foo"> DirectoryIndex index.html DirectoryIndex disabled DirectoryIndex index.php </Directory>
DirectoryIndexRedirect Directive
Description: | Configures an external redirect for directory indexes. |
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Syntax: | DirectoryIndexRedirect on | off | permanent | temp | seeother | 3xx-code |
Default: | DirectoryIndexRedirect off |
Context: | server config, virtual host, directory, .htaccess |
Override: | Indexes |
Status: | Base |
Module: | mod_dir |
Compatibility: | Available in version 2.3.14 and later |
By default, the DirectoryIndex
is selected and returned transparently to the client. DirectoryIndexRedirect
causes an external redirect to instead be issued.
The argument can be:
-
on
: issues a 302 redirection to the index resource. -
off
: does not issue a redirection. This is the legacy behaviour of mod_dir. -
permanent
: issues a 301 (permanent) redirection to the index resource. -
temp
: this has the same effect ason
-
seeother
: issues a 303 redirection (also known as "See Other") to the index resource. - 3xx-code: issues a redirection marked by the chosen 3xx code.
Example
DirectoryIndexRedirect on
A request for http://example.com/docs/
would return a temporary redirect to http://example.com/docs/index.html
if it exists.
DirectorySlash Directive
Description: | Toggle trailing slash redirects on or off |
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Syntax: | DirectorySlash On|Off |
Default: | DirectorySlash On |
Context: | server config, virtual host, directory, .htaccess |
Override: | Indexes |
Status: | Base |
Module: | mod_dir |
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:
- The user is finally requesting the canonical URL of the resource
-
mod_autoindex
works correctly. Since it doesn't emit the path in the link, it would point to the wrong path. -
DirectoryIndex
will be evaluated only for directories requested with trailing slash. - Relative URL references inside html pages will work correctly.
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 </Location>
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.
Also note that some browsers may erroneously change POST requests into GET (thus discarding POST data) when a redirect is issued.
FallbackResource Directive
Description: | Define a default URL for requests that don't map to a file |
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Syntax: | FallbackResource disabled | local-url |
Default: | disabled - httpd will return 404 (Not Found) |
Context: | server config, virtual host, directory, .htaccess |
Override: | Indexes |
Status: | Base |
Module: | mod_dir |
Compatibility: | The disabled argument is available in version 2.4.4 and later |
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> <Directory "/web/example.com/htdocs/blog/images"> FallbackResource disabled </Directory>
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