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"Telerik Fiddler is a free web debugging proxy for any browser, system or platform".
This tool is very handy when you use a aplication which makes server request and you want to troubleshoot. You can download this tool form here.
After the fiddler is installed launch it, you'll see this window:
How to decrypt HTTPS calls
By default Fiddler doesn't capture https calls.
What does it means?
If the service you want to debug is making the calls using https protocol (secure connection) you'll not be able to see the request.
In order to enable the http capturing go to TOOLS -> OPTIONS -> HTTPS -> check Capture Https and Decript options.