Purge URL
From Wikitech
purging specific URLs from Squid cache.
The example below was used to purge http://sep11.wikipedia.org/wiki/ which is a 301 redirect to an external site. [1].
The script requires a --wiki name, so in this case "aawiki" had no specific meaning but had to be added.
/home/wikipedia/common/php/maintenance$ echo 'http://sep11.wikipedia.org/wiki/' | mwscript purgeList.php --wiki aawiki Purging 1 urls... Done!