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From "West, Chris" <chris.w...@eds.com>
Subject RE: [users@httpd] Comparing environmental variables in httpd.conf for conditional logic
Date Mon, 21 May 2007 12:03:26 GMT
Hi Krist,

The SERVER_NAME variable is a standard HTTP header environment variable
from the request we issue for the website.  Perhaps I was making a
mistake with the way that I was referencing the variable.  Thanks for
the reply, I can now definitely discount the SetEnvIf method at least,
and go back to try some more attempts with the rewritecond statement.

Regards

Chris West
Information Analyst
EDS - UKIMEA Commercial AIU
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-----Original Message-----
From: Krist van Besien [mailto:krist.vanbesien@gmail.com] 
Sent: 21 May 2007 12:46
To: users@httpd.apache.org
Subject: Re: [users@httpd] Comparing environmental variables in
httpd.conf for conditional logic

On 5/21/07, West, Chris <chris.west@eds.com> wrote:
>
>
>
> I am trying to perform some conditional logic in my httpd.conf file 
> comparing two environment variables, the result of which will be used 
> to limit the logging in my referer logfile.  I have tried using both 
> SetEnvIf and RewriteCond to perform the logic in the following ways.
>
> 1:  Using SetEnvIf
>
>     SetEnvIf Referer SERVER_NAME dont_log_ref
>     CustomLog "|rotatelogs.exe logs/referer_log_iuk 86400" combined 
> env=!dont_log_ref
>
> 2.  Using Rewrite rules
>
>      #
>      # Set an env variable when we don't want to log the referer.
>      #
>     RewriteCond %{HTTP_REFERER} ^.*%{SERVER_NAME}.*$
>     RewriteRule .* - [E=dont_log_referer:true]
>     CustomLog "|rotatelogs.exe logs/referer_log_iuk 86400" combined 
> env=!dont_log_referer
>
>
> For both methods, I have tried referencing SERVER_NAME variables as 
> above and also in form %{SERVER_NAME} and also %{ENV:SERVER_NAME}.  
> None of these seem to work for the comparison however
>
> If I hardcode the comparison it works OK i.e.
>
> RewriteCond %{HTTP_REFERER} ^.*my_test_server.*$ RewriteRule .* - 
> [E=dont_log_referer:true] CustomLog "|rotatelogs.exe 
> logs/referer_log_inter 86400" combined env=!dont_log_referer
>
> Any help would be much appreciated.

Is the "SERVER_NAME" environment variable set in the shell that is used
to start Apache; or is it set elsewhere? In the context of an discussion
about apache "Environment variable" can mean two things, it is important
to know which meaning it has here.

Now, as far as I know you cannot use environment variables in the regex
part of a SetEnvIf statement. So your first solution will not work.

the second solution can work, but you need to refer to
%{ENV:SERVER_NAME} if you want an environment variable, and not a
mod_rewirte variabla.

Krist

--
krist.vanbesien@gmail.com
Bremgarten b. Bern, Switzerland
--
A: It reverses the normal flow of conversation.
Q: What's wrong with top-posting?
A: Top-posting.
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