I would like to try and reduce the number of rewrite rules I have (from 5000)
to a much smaller number of rewrite maps. My main goals in doing this are to
improve site performance, and make configuration more manageable.I need to be
able to handle the following cases:/dir1/link1 -> /dir1/other1/dir1/link2
-> /dir1/random2/dir1/link3 -> /dir1/link3 [no change, and I don't know
all the possible URL's]/dir2/link4 -> /dir3/link5
The best I've been able to come up with in the Apache config is:
RewriteMap map-urla txt:/path/to/map-urlaRewriteCond
${map-urla:$1} >"" [NC]RewriteRule
^/dir1/map-urla(.*)$ /dir1/${map-urla:$1} [R]
This works in terms of getting URL's to the write place, but before I expend a
colossal amount of effort rewriting over 5000 lines of config, I'm hoping to
clarify that this will actually provide a performance benefit.In particular,
will it only evaluate the /dir1/ path once, and skip over this for other urls
(eg. /dir2/) or will the rewriteCond be evaluated first going through every
line in the rewritemap prior to evaluating the /dir1?
Background:I've just inherited an apache server with about 5000 RewriteRules!
The majority of which are currently being evaluated for nearly every request,
which I can't imagine is going to be good for performance.A lot of the rewrites
are a result of the site owner wishing to ensure original URL's continue to
work after the site was restrucutred (due to external links and associated SEO
value of those links).Because page names have been changed, this was done as
individual rewrite rules for enormouse numbers of pages.
My initial thoughts were that a rewrite map would be much more efficient.
However, because in quite a few cases, it's only the page names that have
changed and not the directory name, I'm not sure if this will be more
efficient, due to my having to add a RewriteCond to ensure that therewrite rule
doesn't create a circular redirect / failure for the new pages (the names of
which I often don't know).
Any advice on how this will be evaulated, it's relative efficiency or any
better approaches would be greatly appreciated.
Thanks,Paul
