Re: Order of Proxy matching

André Warnier <aw@xxxxxxxxxx> · Mon, 25 May 2009 11:28:46 +0200

Evan Champion wrote:

Hi,

Can anyone advise of the order in which <Proxy> statements matching the
same URL are matched?

I am using SetEnvIf to set a variable that is saved later in the
access_log.  Sometimes there is a more specific match and a less
specific match for the same URL, e.g.:

<Proxy http://server1.example.com/*>
	SetEnvIf Server_Addr . VAR=first
      Allow from all
</Proxy>

<Proxy http://*.example.com/*>
	SetEnvIf Server_Addr . VAR=second
      Allow from all
</Proxy>

My observation is that the matches are done in reverse order of
appearance in the configuration, i.e. in this example, a request to
http://server.example.com/ will match the http://*.example.com/* rule
and the variable will be set to "second".  Is it generally correct that
matches are in reverse order of appearance in the configuration?

I don't know the details of how <Proxy> sections work, but there is an 

alternate possible explanation to what you are seeing :

*both* sections above are run, in the order in which they appear, 

because both of them match.

So the first SetEnvIf is executed (VAR=first), but the second one 

overwrites it (VAR=second).

I believe in this case you may want to use some RewriteCond/RewriteRule 

(mod_rewrite) to do what you want.

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