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Asked: 2026-05-11T12:40:08+00:00

/foo/.htaccess does an internal redirect RewriteRule ^(.*)$ /bar/?%{ENV:UNIQUE_ID} /bar/.htaccess needs to recognise that the

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/foo/.htaccess does an internal redirect

RewriteRule ^(.*)$ /bar/?%{ENV:UNIQUE_ID}

/bar/.htaccess needs to recognise that the request was NOT internal, the issue is that I cannot figure out how to make the comparision work

RewriteCond %{ENV:UNIQUE_ID} !%{QUERY_STRING}

even a 

RewriteCond %{QUERY_STRING} %{QUERY_STRING}

won’t match, I suppose there is a syntax issue in the right-hand of the expression, escaping % doesn’t help.

I tested that the above both variable have the same value on an internal redirect as

RewriteRule ^(.*)$ /test/%{QUERY_STRING}/%{ENV:UNIQUE_ID}

would show it.

The server is Apache/2.2.3

Thanks, Laurian

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1 Answer

  1. Sadly you cannot compare two variables directly with mod_rewrite. (Or at least I don’t know how to do this either.)

    But there is a workaround for this:

    RewriteCond %{ENV:UNIQUE_ID}:%{QUERY_STRING} !^(.+):\1$

    I chose the : as separator but you can use any other separator if you want to. And if you can specify the structure of UNIQUE_ID values, you should do that.

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