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I have siteminder protecting an Oracle ADF java faces app. It appears I am going to have to intercept an http reqeust for the logout link delivered by Oracle in order to kill the siteminder session. I have narrowed it down to a parameter in the URI logout=true always being present when a user is logging out. I would like mod_rewrite to find this string and redirect to a static logout page defined locally to the apache proxy.

Is this feasible?

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up vote 1 down vote accepted
RewriteEngine on
RewriteCond %{QUERY_STRING} ^(.*)logout=true(.*)$
RewriteRule .* http://yourserver/your_static_uri [R,L]
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He's looking for a redirect, so a [R] may be in order. – Shane Madden Aug 1 '11 at 5:02
Agreed; should I update the answer to reflect this? – Marco Bizzarri Aug 1 '11 at 5:03
Either way - I think it's a good answer as is, if he needs to tweak the behavior then he can probably figure it out from there. But, it's your answer, do what you see fit :). – Shane Madden Aug 1 '11 at 5:07
@Marco If I could rate this answer on a scale of 5 you would have max 4 -- it's definitely on right direction, but it may produce false redirects if query string will be somehow similar to a desired one. For example: DOlogout=trueSound&kitten=yes. I perfectly understand that such situation may never happen (but... who knows what query strings OP may use) .. therefore treat this comment as 1 more step to make the rule even better/more accurate (and we are not talking here about case sensitivity). – LazyOne Aug 1 '11 at 8:01
@LayOne: thanks for your suggestions on how to improve my answer; later I'll take a review of it and I'll try to improve it; besides, it could be optimized for sure, adding a few special cases that allow the regular expression engine to match quickly (like if the logout parameter is the last one, or the first one). – Marco Bizzarri Aug 1 '11 at 13:32


RewriteEngine    On
RewriteCond      %{QUERY_STRING}=".*logout=true.*"
RewriteRule      .* /path/to/other/location

You should really read the mod_rewrite documentation. There's a lot you can do with it.

share|improve this answer
I think this would not work: RewriteRule, IIRC, just matches on the hostname/uri part, not on the query string. – Marco Bizzarri Aug 1 '11 at 5:00
Ah, yes, that's right. Thanks, updated. – bahamat Aug 1 '11 at 5:11
Yup, the parameters after the ? (the "query string" in apache's docs, which is terribly unhelpful wording in the context of a web server) is excluded from the matching pattern for RewriteRule. From the docs: the part of the URL after the hostname and port, and before the query string (e.g. "/app1/index.html"). – Shane Madden Aug 1 '11 at 5:12
thanks much folks. was not leveraging the RewriteCond I will give it a shot and update. – organicit Aug 2 '11 at 19:09

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