Difference between revisions of "Apache httpd/mod rewrite"
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(Created page with "==Syntax== The [http://httpd.apache.org/docs/2.4/mod/mod_rewrite.html Apache manual] says: * '''RewriteRule''' {{arg|Pattern}} {{arg|Substitution}} [{{arg|flags}}] * '''Rewri...") |
(→RewriteRule: more complete example set) |
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Line 20: | Line 20: | ||
** '''filesystem-path''' (only in VirtualHost) | ** '''filesystem-path''' (only in VirtualHost) | ||
− | + | ===examples=== | |
− | * | + | (also from the Apache manual) |
+ | |||
+ | The following apply inside the per-directory configuration* for <code>/somepath</code> for request <code>GET /somepath/localpath/pathinfo</code> | ||
+ | : (*<code>/physical/path/to/somepath/.htaccess</code>, with <code>RewriteBase "/somepath"</code>) | ||
+ | |||
+ | <table class="listing"><tr class="header"> | ||
+ | <th>Given Rule</th> | ||
+ | <th>Resulting Substitution</th> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>^localpath(.*) otherpath$1</td> | ||
+ | <td>/somepath/otherpath/pathinfo</td> | ||
+ | </tr> | ||
+ | <tr class="odd"> | ||
+ | <td>^localpath(.*) otherpath$1 [R]</td> | ||
+ | <td>http://thishost/somepath/otherpath/pathinfo via external | ||
+ | redirection</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>^localpath(.*) otherpath$1 [P]</td> | ||
+ | <td>doesn't make sense, not supported</td> | ||
+ | </tr> | ||
+ | <tr class="odd"> | ||
+ | <td>^localpath(.*) /otherpath$1</td> | ||
+ | <td>/otherpath/pathinfo</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>^localpath(.*) /otherpath$1 [R]</td> | ||
+ | <td>http://thishost/otherpath/pathinfo via external redirection</td> | ||
+ | </tr> | ||
+ | <tr class="odd"> | ||
+ | <td>^localpath(.*) /otherpath$1 [P]</td> | ||
+ | <td>doesn't make sense, not supported</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>^localpath(.*) http://thishost/otherpath$1</td> | ||
+ | <td>/otherpath/pathinfo</td> | ||
+ | </tr> | ||
+ | <tr class="odd"> | ||
+ | <td>^localpath(.*) http://thishost/otherpath$1 [R]</td> | ||
+ | <td>http://thishost/otherpath/pathinfo via external redirection</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>^localpath(.*) http://thishost/otherpath$1 [P]</td> | ||
+ | <td>doesn't make sense, not supported</td> | ||
+ | </tr> | ||
+ | <tr class="odd"> | ||
+ | <td>^localpath(.*) http://otherhost/otherpath$1</td> | ||
+ | <td>http://otherhost/otherpath/pathinfo via external redirection</td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td>^localpath(.*) http://otherhost/otherpath$1 [R]</td> | ||
+ | <td>http://otherhost/otherpath/pathinfo via external redirection (the [R] flag is redundant)</td> | ||
+ | </tr> | ||
+ | <tr class="odd"> | ||
+ | <td>^localpath(.*) http://otherhost/otherpath$1 [P]</td> | ||
+ | <td>http://otherhost/otherpath/pathinfo via internal proxy</td> | ||
+ | </tr> | ||
+ | </table> |
Revision as of 10:47, 3 March 2017
Syntax
The Apache manual says:
- RewriteRule <Pattern> <Substitution> [<flags>]
- RewriteCond <TestString> <CondPattern> [<flags>]
- RewriteBase <URL-path>
I think I still don't really understand RewriteBase. Apparently it does need to refer to a path that actually exists, rather than a mapped path. If the path doesn't exist, Apache will log a "core:alert" error saying "RewriteBase: argument is not a valid URL".
RewriteRule
Arguments:
- Pattern is a perl compatible regular expression, matched against:
- if VirtualHost context: the part of the URL after the hostname and port, and before the query string (e.g. "/app1/index.html").
- if per-directory context (Directory and .htaccess): the partial path to the Directory or .htaccess file
- e.g. a request of "/app1/index.html" may result in comparison against "app1/index.html" or "index.html" depending on where the RewriteRule is defined.
- The directory path where the rule is defined is stripped from the currently mapped filesystem path before comparison (up to and including a trailing slash). The net result of this per-directory prefix stripping is that rules in this context only match against the portion of the currently mapped filesystem path "below" where the rule is defined.
- Substitution may be:
- URL-path: A DocumentRoot-relative path to the intended target
- Absolute-URL: if the hostname matches the current host, the scheme and hostname are stripped out and the resulting path is treated as a URL-path. Otherwise, an external redirect is performed.
- filesystem-path (only in VirtualHost)
examples
(also from the Apache manual)
The following apply inside the per-directory configuration* for /somepath
for request GET /somepath/localpath/pathinfo
- (*
/physical/path/to/somepath/.htaccess
, withRewriteBase "/somepath"
)
Given Rule | Resulting Substitution |
---|---|
^localpath(.*) otherpath$1 | /somepath/otherpath/pathinfo |
^localpath(.*) otherpath$1 [R] | http://thishost/somepath/otherpath/pathinfo via external redirection |
^localpath(.*) otherpath$1 [P] | doesn't make sense, not supported |
^localpath(.*) /otherpath$1 | /otherpath/pathinfo |
^localpath(.*) /otherpath$1 [R] | http://thishost/otherpath/pathinfo via external redirection |
^localpath(.*) /otherpath$1 [P] | doesn't make sense, not supported |
^localpath(.*) http://thishost/otherpath$1 | /otherpath/pathinfo |
^localpath(.*) http://thishost/otherpath$1 [R] | http://thishost/otherpath/pathinfo via external redirection |
^localpath(.*) http://thishost/otherpath$1 [P] | doesn't make sense, not supported |
^localpath(.*) http://otherhost/otherpath$1 | http://otherhost/otherpath/pathinfo via external redirection |
^localpath(.*) http://otherhost/otherpath$1 [R] | http://otherhost/otherpath/pathinfo via external redirection (the [R] flag is redundant) |
^localpath(.*) http://otherhost/otherpath$1 [P] | http://otherhost/otherpath/pathinfo via internal proxy |