rewriteengine on rewriterule ^/a/b$ ^/c$ not working,but
rewriteengine on rewritebase / rewriterule ^a/b$ ^c$ works.
- 1@unknown-- this is a good question. If you don't get anyone to bite here, you might try moving it to serverfault.com. I also encourage you to accept answers to more of your questions and possibly even answer some questions along the way, too...Michael Haren– Michael Haren2010-01-26 04:21:25 +00:00Commented Jan 26, 2010 at 4:21
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2 Answers
It's probably not the RewriteBase that makes the rule work so much as the leading slash. Also, the second argument to RewriteRule isn't a regular expression. Instead, try:
RewriteRule ^/?a/b$ c When applying a RewriteRule from .htaccess, the leading slash will be stripped from the URL, which will cause the pattern to fail if you include it. By starting a pattern with "^/?", it will work in the main configuration files and in per-directory config files.
Read over the detailed mod_rewrite documentation for the details of how the rewrite engine works and the significance of RewriteBase.
Edit: As mentioned in the mod_rewrite technical details and described in the documentation for RewriteRule and RewriteBase, the URL has been translated to a path by the time the per-directory rewrite rules are evaluated. The rewrite engine no longer has a URL to work with. Instead, it removes the local directory prefix (the directory holding the .htaccess file), which ends with a slash. For example, suppose a visitor requests "/var/www/foo/bar/baz.html" and there is a rewrite rule set in "/var/www/foo/.htaccess". Fore each rule, the rewrite engine will strip "/var/www/foo/", leaving "bar/baz.html" to be matched against the rewrite rule. After processing a rule, the local directory prefix is prepended (unless the replacement begins with "http://"). After all the rewriting rules have been processed, the rewrite base, if set, replaces the local directory prefix; if not, the document root is stripped. The rewritten URL is then re-injected as a sub-request.
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user198729
Can you elaborate why the leading slash is stripped when applied from
.htaccess?What version of Apache are you using? RewriteBase should not be necessary when you are rewriting from the root. If you are not, you may need it. For instance, a part of my current configurations (Apache 2.2) for one of my blogs looks as follows, and works:
RewriteEngine On RewriteRule ^/$ /blog/ [R] RewriteRule ^/wordpress/(.*) /blog/$1 [R] 