Adding a header to a number of requested urls

I am attempting to add a header to a number of requested urls i.e. domain/feeds/chicago, domain/feeds/*
I understand that this can be achieved by

•using mod_rewrite to set an environment variable
•using mod_headers to add a header based on the existence of an environment variable.

So far I can add the a new header thus

Header add RSS_FEED_URL "Akamai-Edge-Control"

I'm looking for some pointers as to how to achieve this.

 

You could try something like:

# Untested, but play around with the flags, it may work
RewriteRule ^/feeds/([\w\d_-]+)$ /feed.php?name=%1 [PT,QSA,E=akamai:1]

Code (markup):

That will pass the processing of feed requests to a PHP script called feed.php where you could do a getenv('akamai'), and whatever other checks you need to do.

Something like:

<?php
if (getenv('akamai') == 1)
{
  header("RSS_FEED_URL: Akamai-Edge-Control");
}
?>

PHP: