Here are some tools that can help with various tasks:
- HTTP request analyzer - displays your "external" IP address as well as all the headers sent by the browser and a list of request parameters (if provided).
Useful for finding your IP, checking browser parameters and analyzing web forms.
- URL analyzer - splits a URL into components and parses the query string into parameters.
Useful for analyzing complex URLs, especially ones with a very long query string which includes encoded URLs for parameter values.