Developer maps NGINX's internal state machine, clarifies 502 and 504 error origins

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A developer analyzed the open-source NGINX stable 1.30 release as a hierarchical state machine. The analysis details specific conditions under which the web server generates 502 and 504 error codes. For instance, upstream timeouts result in a 504, while connection errors or invalid headers trigger a 502. The full technical breakdown, verified against official documentation and source code, is available on the author's personal website.

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