FiddlerWebDebuggerTool

The Fiddler tool helps you debug web applications by capturing network
traffic between the Internet and test computers. The tool enables you to inspect
incoming and outgoing data to monitor and modify requests and responses before
the browser receives them. Fiddler also includes a powerful event-based
scripting subsystem, which you can extend by using any .NET Framework
language.

Fiddler and the HTTP replay options can help you troubleshoot client-side
issues with web applications by making an offline copy of the test site. With
these tools, you can create offline images of the browsing experience and then
package and analyze the results to obtain more detailed debug information.

To download the Fiddler add-on, go to the Internet
Explorer add-ons page. For more information about how to troubleshoot
by using Fiddler and related tools, see the How
to use fiddler and HTTP replay to have an offline copy of your
site blog post and the Troubleshooting
Authentication with Fiddler blog post.

http://msdn.microsoft.com/en-us/library/windows/desktop/ff966510(v=vs.85).aspx

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