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Re:Charles – Web Debugging Proxy Application by sleazebreeze on Sunday June 26, 2016 @10:56AM (#11981048)
I am most familiar with Telerik's free product Fiddler. Looks like a similar feature set to Charles.

http://www.telerik.com/fiddler

Re:Charles – Web Debugging Proxy Application by spo81rty on Sunday June 26, 2016 @01:32PM (#11981684)
On Windows at least, Fiddler has always been the tool of choice for this amongst everyone I know too.