[users@httpd] AliasMatch with env variable

[Richard Lewis <ri...@fastmail.co.uk>]

Hi there,

Does Apache (1.3) allow me to use arbitrary environment variables in
arbitrary places?

e.g.

# set 'site_version' to the base directory for the user's browser
SetEnv site_version /var/www/default
BrowserMatchNoCase msie site_version=/var/www/explorer
# etc...

# and later on direct requests for CSS stylesheets
# to the correct location using 'site_version'
AliasMatch "^.*/([^/]*).css" $site_version/$1.css

So, when an HTML page includes:
<link rel="stylesheet" type="text/css" href="style.css" />

an error message in /var/log/apache/error.log appears like this:
[date] [error] [client ] File does not exist: $site_version/style.css

its not translating '$site_version' in AliasMatch to the value of the
variable.

Is it supposed to? And, if not, how can achieve this?

Cheers,
Richard
-- 
  Richard Lewis
  richardlewis@fastmail.co.uk


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Re: [users@httpd] AliasMatch with env variable

[Joshua Slive <js...@gmail.com>]

On Thu, 18 Nov 2004 11:49:38 +0000, Richard Lewis
<ri...@fastmail.co.uk> wrote:
> Hi there,
> 
> Does Apache (1.3) allow me to use arbitrary environment variables in
> arbitrary places?

No.  httpd.conf is a configuration files, not a programming language.

> AliasMatch "^.*/([^/]*).css" $site_version/$1.css

Some choices:

1. Use mod_rewrite, which can look at environment variables (though
using a different syntax; check the docs).

2. There are at least a couple of third-party modules that do macro
substitution in 1.3 configs.  I believe one of them is called
mod_macro.  Check http://modules.apache.org/.

3. Use a config pre-processor like m4 to do substitution for you. 

Joshua.

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