QueryString module for Varnish Cache
The purpose of this module is to give you a fine-grained control over a URL's query-string in Varnish Cache. It's possible to remove the query-string, clean it, sort its parameters or filter it to only keep a subset of them. This can greatly improve your hit ratio and efficiency with Varnish, because by default two URLs with the same path but different query-strings are also different. This is what the RFCs mandate but probably not what you usually want for your web site or application. A query-string is just a character string starting after a question mark in a URL. But in a web context, it is usually a structured key/values store encoded with the `application/x-www-form-urlencoded' media type. This module deals with this kind of query-strings.