I have the plugin working with 2.1.7 and it is currently available at http://ats-cache-proxy.googlecode.com/svn/trunk/trafficserver_cacheurl/ .
It builds with tsxs (tsxs -c cacheurl.c -o cacheurl.so). To enable it, add cacheurl.so to your plugin.config file. You will also need to create a cacheurl.config file which goes in the plugin directory (libexec usually) that contains patterns/replacements - one per line. Comments are allowed using '#'. An example config file is available here: http://ats-cache-proxy.googlecode.com/svn/trunk/install/cacheurl.config Let me know if there are any issues getting things working, Mark
