I made a varnish urlsort module a while ago: https://github.com/cyberroadie/varnish-urlsort https://github.com/cyberroadie/varnish-urlsort Here my blog post ab

I made a varnish urlsort module a while ago: https://github.com/cyberroadie/varnish-urlsort https://github.com/cyberroadie/varnish-urlsort Here my blog post about it: http://cyberroadie.wordpress.com/2012/01/05/varnish-reordering-query-string/ http://cyberroadie.wordpress.com/2012/01/05/varnish-reorderi... It parses the url and every token gets added to a binary tree which than gets traversed in order to get the parameters alphabetically It's been used in production in several companies I worked for, so tried and tested :-) Olivier