It’s Strange, but I’ve never realized that these tolls exist. Shame on me, I know.
First, Web Devloper Helper by Nikhil Kothari is plugin for Internet Explorer. It allows tracking HTTP traffic, debugging script, displaying ViewState, exploring DOM and more. It opens as a tab inside IE.
Second tool is named Fiddler and according to information in About option is made by Microsoft Corporation. Don’t know why this tool is not located on Microsoft website. Is this another Microsoft Corporation? This is advanced HTTP traffic tracking tool. You view very detailed content information or event set breakpoints. What is interesting, Fiddler is working in higher (or lower) level and track all HTTP traffic, even if it is not made by IE. For example, I’m using Maxthon browser and Fiddler is able to track its HTTP traffic. Number of information served by this tool is impressive.
Cheers