Fiddler and Visual Studio Web Server - Cassini

If you have been tried using Fiddler in localhost of Visual Studio inbuilt Web Server called Cassini, you mite have noticed that you will receive a HTTP 502 error. Saying [Fiddler] Connection to localhost failed.

To solve this you might try adding period (.) after localhost as shown below.

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For some machines it seems to work but some it doesn’t. In case in yours it doesn’t work try changing localhost to 127.0.0.1 and then adding period (.) after it.

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