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CHARLES also works really well and in my opinion has a better UI than Fiddler.

It can also be used to capture encrypted traffic on another device.

Worth pointing out that Charles isn't free [0], unlike Fiddler. It used to be that on Mac/Linux you didn't have many choices but there is now a Beta of Fiddler for Mac and an Alpha for Linux (using Mono) [1].

[0]: https://www.charlesproxy.com

[1]: https://www.telerik.com/download/fiddler

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