Apache Proxy requested based on URL parameter

Question

Remapping Apache to a TC backend, but I would like to filter out unless a certain parameter is set.

ie. http://server/myapp?project=mine maps to http:server:8080/myapp?project=mine

There will be more parameters (though I will enforce project=mine as the last).

ProxyPassMatch works but not for parameters.

I tried

RewriteCond %{QUERY_STRING} project=mine
RewriteRule (.*) localhost:8080

Seems to be close, but testing in CURL I get: This document moved...

Which I do not get with ProxyPass or ProxyPassMatch

What am I missing ?

Tips/pointers/RTFMs appreciated

Answer 1

You need to use the P flag on the RewriteRule to pass the request through mod_proxy, as opposed to being treated as an external 3xx redirect (ie. "this document has moved" msg).

For example, if used directly in the <VirtualHost> container:

RewriteCond %{QUERY_STRING} (^|&)project=mine$
RewriteRule ^/myapp$ http://server:8080$0 [P]

The condition checks for the URL parameter project=mine at the end of the query string. Only the URL-path /myapp is matched (as in your example).

The $0 backreference contains the entire URL-path that is matched by the RewriteRule pattern. This simply saves repeating /myapp in the substitution string.

---

RewriteCond %{QUERY_STRING} project=mine
RewriteRule (.*) localhost:8080

There are a few issues with your initial attempt (apart from the missing P flag):

• You are matching any URL-path, eg. /anotherapp would also be caught. But this is also discarded.
• The regex project=mine matches that string anywhere in the query string, even as part of other URL params. eg. fooproject=miner would also match.
• localhost:8080 is not a valid substitution string.