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Practical guides for seeing what your apps send, and for making them misbehave on purpose.

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funtesting

Turn any API into a teapot: testing error handling with HTTP 418

Make a real server answer "I'm a teapot" on demand. A silly status code that's secretly the best way to find out whether your app copes with errors it has never heard of.

October 5, 2026 5 min