Fiddler is a free Web debugging proxy that works seamlessly on most platforms, systems and browsers. It logs all incoming and outgoing traffic from your computer to the Internet and allows you to debug traffic from virtually any application that supports a proxy.
It is possible to manipulate and edit Web sessions with Fiddler a simply set breakpoint so that the process can be stopped the session, making you the opportunity to modify the request or response. As well as Web session manipulation You too need to create your own HTTP requests to run through Fiddler allows to reproduce complex scenarios, or really difficult to test.
We all know that security is really important, so you'll be pleased to hear that Fiddler also has that under control. You can all HTTPS traffic or specific sessions to test your Web applications by decipher. Still, You too can ensure that all cookies, headers and caching directives that are transferred between the server and the client are all right.
There is a variety of ready-made Add-ons available to make Fiddler, highly customizable and flexible to adapt to your needs. However, it is worth noting that even though the interface looks simple, many functions and tools are therefore more suitable for power users, developers, testers, and administrators.
Please note that this download for users of .NET 4, but a version for users of .NET 2 is also available.