One easy way to achieve this is to create a faux directory that actually runs a CGI script. Something like

ScriptAlias /css /qsys.lib/yourlib.lib/csscgi.pgm

Then when someone gives a URL like http://yoursys/css/myfile.css it will run the yourlib/csscgi program. That program can interrogate it's REQUEST_URI to find out which file was requested, it can do it's processing, and then dump the needed CSS file out to Apache (which in turn will send it to the browser.)

Since it's running your program every time, you can insert any code you like.

But, beware of the performance implications if this is a high-volume server.

On 2/27/2013 3:24 PM, Steve Richter wrote:
Is it possible for the apache server to be configed so that code runs
before a .css or .js file is served to the browser?

For example, before a .js or .css file is served, run code that redirects
to another file. Or maybe you have some non standard code in a .js file
that is intended to make the javascript more functional and needs to be
translated to actual javascript at the time the .js file is served to the

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