A 5xx status means the server failed to complete a request it should have been able to handle.

500 Internal Server Error: an unexpected application failure.
502 Bad Gateway: a gateway received a bad upstream response.
503 Service Unavailable: the service is overloaded or temporarily down.
504 Gateway Timeout: an upstream service did not answer in time.

The response shown to a visitor should be calm and generic. Detailed diagnostics belong in server logs, connected by a request ID when possible.

When debugging, check the exact status, response body, server logs, and whether another service sits between client and application. A gateway error may not come from your application process at all.

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