Any good Postman alternatives for local or offline debugging?

I’ve been looking for a Postman alternative that can run offline or even be self-hosted for debugging/testing APIs locally. Most tools I’ve tried either require internet access or lack key debugging features.

Anyone using something solid for local API testing, especially with offline support?
Bonus if it’s open source or has a lightweight UI.

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I hope it’s in here…

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how about fast api?

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