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From "Joshua Slive" <>
Subject Re: [users@httpd] RewriteMap questions
Date Wed, 30 May 2007 19:06:27 GMT
On 5/30/07, Josh Trutwin <> wrote:
> I have been asked to create rewrite rules for sites that use an old
> page naming scheme to a new one.  The first attempt was to create
> a .htaccess file that had a rewrite rule for every page, something
> like:
> RewriteRule ^new_page_name.php$ /sitepages/pid123.php [L,QSA,NC]
> Works ok for small sites, but some of them have thousands of pages
> which translates to thousands of RewriteRules which of course bogs
> down the apache server.
> I was going to look at creating a rewritemap using a .db hash file -
> my main concern is that we have some existing URL's that map to
> actual files on the system.  My thought was to do something like this:
> RewriteMap existing  prg:/path/to/file/
> RewriteMap redirects dbm:/path/to/file/map.db
> RewriteRule ^/(.*) ${existing:$1} [L,QSA]
> RewriteRule ^/(.*) ${redirects:$1} [L,QSA]
> My thought being that the first map is a program that tests if the
> URL matches an actual file/dir in the doc root, returning NULL if it
> doesn't.  If it matches then processing would stop and the first
> RewriteRule would work.  But if it doesn't match, does the second
> RewriteRule even get executed?  If not, do I then have to resort to a
> single map that is a perl program that first checks if the URL maps
> to a page and if not manually reads the map file?
> Also, curious if anyone has a PhP example of a map program, I'm a
> little more proficient in that - or even python...

Don't use a map program if you can avoid it. The dbm maps are safer and faster.

What you want is easy enough to get, using something like

RewriteCond ${existing:$1|NOT-FOUND} =NOT-FOUND
RewriteRule ^/(.*) ${redirects:$1} [L,QSA]

You could also, if you want, simply use a RewriteCond to test if the
file being requested exists on the filesystem. See the -d and -f


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