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

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)?

This question is related to http client http-status-codes status http-status-code-415

The answer is

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

Source: Stackoverflow.com

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