That could possibly be implemented as a hash of the included header/response terms. A simple example could be http://www.google.com/search?hl=en&q=hacker+news+

That could possibly be implemented as a hash of the included header/response terms. A simple example could be http://www.google.com/search?hl=en&q=hacker+news+site:ycombinator.com&btnG=Search http://www.google.com/search?hl=en&q=hacker+news+site:yc... -> http://www.google.com/search?#b9fh23 http://www.google.com/search?#b9fh23 One downside would be that you can't see the query parameters and values in plaintext, but a browser extender / inspector could probably do this.