Sniffers are tools that allow you to intercept, analyze and modernize all requests that pass through them. They are useful when you need to extract some information from a stream or create a desired server response. This is how you can unit test a product that has a back-end, a front-end, and different teams with their own versioning.
In this article, I will talk about the main sniffing functions that can be useful to QA. I will try not to go into theory, but to focus on practice. The most popular representatives of traffic analyzers are now WhireShark, Fiddler and Charles Proxy. We can talk about the convenience of the interfaces and the functionality of each of them for a long time, taking into account all the pros and cons. But here I gave preference to Charles, since I actively use it myself. I will use his example.
Charles Proxy
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IP- (ipconfig) Charles Proxy (Help -> Local IP Address).
, Help -> SSL Proxying -> Install Charles Root Certificate on mobile device remote browser.
Charles Proxy HTTP- . HTTPS, - SSL- Charles Proxy .
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Android Settings -> Trusted Credentials User.
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Map remote
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Map Local
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Rewrite
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Throttling
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Repeat Advanced
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P.S. . VK, FB, Instagram Telegram-, Maxilect.