The Web Application Hacker’s Handbook Discovering and Exploiting Security Flaws

You can use Dean Edwards’s JavaScript packer to shrink a given script as

far as possible by eliminating unnecessary whitespace. This utility also converts

scripts to a single line, for easy insertion into a request parameter:

http://dean.edwards.name/packer/

The second, potentially more powerful, technique for beating length limits

is to span an attack payload across multiple different locations where user-

controllable input is inserted into the same returned page. For example, con-

sider the following URL:

https://wahh-app.com/account.php?page_id=244&seed=129402931&mode=normal