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I would like htaccess to rewrite




I'm importing a bunch of pages that have ampersands in the title from MediaWiki. These are encoded as %26. Drupal, for various reasons, has decided double encode the URL to have it become %2526. I simply can't create the alias within Drupal so I have to use htaccess.

This is what I have as my rule so far:

RewriteRule ^w/([^%26]+)\%26(.*)$ w/$1\%2526$2 [R=301]

I asked this question three months ago on stackexchange and was not able to get it working. I tried hiring a contractor for this but was unable to find one. So this is my last ditch effort before I completely give up. I really appreciate the help.

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migrated from serverfault.com Mar 27 '11 at 8:00

This question came from our site for system and network administrators.

In all honesty, wouldn't it be better for everyone involved to run an UPDATE query against drupal's database to convert all the %26's back to ampersands, so that Drupal stops double-encoding them? – DerfK Jan 3 '11 at 16:49
@DerfK That would break links from other sites. Since there's about a 1000 pages with this problem, I would like to avoid this but if I don't find a solution, then that I just have to do it. Thanks – Patrick Jan 3 '11 at 17:02

'noescape|NE' (no URI escaping of output)

This flag prevents mod_rewrite from applying the usual URI escaping rules to the result of a rewrite. Ordinarily, special characters (such as '%', '$', ';', and so on) will be escaped into their hexcode equivalents ('%25', '%24', and '%3B', respectively); this flag prevents this from happening. This allows percent symbols to appear in the output

mod_rewrite Documentation at Apache.org

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Have a look at my answer (on Drupal.SE) to the question "How to use the Rules module to implement a custom redirect for an outdated URL?". I bet the solution described there (using the Rules module) also works for this case.

As detailed in that answer: the "clue" to get this to work, is to use the Rules Event "Drupal is initializing". That will ensure that the rule gets triggered BEFORE the actual content is shown.

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To redirect a request for /something%26else (or /something&else, since the ampersand does not need to be escaped in the URL-path) to /something%2526else (ie. /something%26else when decoded) then you could do something like:

RewriteRule ^(something)&(else)$ /$1\%26$2 [R,L]

The RewriteRule pattern matches against the %-decoded URL-path (ie. &, not %26). So you should simply specify & (ampersand) literally.

The % (percent) in the RewriteRule substitution needs to be backslash escaped in order to represent a literal %, otherwise it's going to be seen as a backreference to the last matched CondPattern, and there isn't any, so %2 would otherwise becomes an empty string!

Without the NE (noescape) flag, mod_rewrite will automatically encode the substitution URL, which is actually what we want in this instance: %26 gets encoded as %2526. (Which, when decoded, is seen as a literal %26.)

Alternatively, you could use the NE flag (that danlefree mentions) and then manually encode the substitution:

RewriteRule ^(something)&(else)$ /$1\%2526$2 [R,L,NE]
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