According to the RFC 10 5 3 502 Bad Gateway The server while acting as a gateway or proxy received an invalid response from the upstream server it accessed in attempting to fulfill the request Can invalid response also mean no response at all e g connection refused

[http] Should a 502 HTTP status code be used if a proxy receives no response at all?

Yes. Empty or incomplete headers or response body typically caused by broken connections or server side crash can cause 502 errors if accessed via a gateway or proxy.

For more information about the network errors

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

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