what is 502 Bad Gateway?

[oliviasrodriguez]

Please give details about this term and removal method for this error.

[apsarabanu]

Hi everyone,
          A server is acting as a gateway or proxy to fulfil the request by the client to access the requested URL. This server received an invalid response from an upstream server it accessed to fulfil the request.

[Shikha Singh]

A 502 Bad Gateway indicates that the edge server (server acting as a proxy) was not able to get a valid or any response from the origin server (also called upstream server).

[RH-Calvin]

The 502 Bad Gateway error is an HTTP status code that means that one server received an invalid response from another server.

[jaysh4922]

502 Error occurs when the server acting as a gateway or proxy and received an invalid response from the server. A bad gateway error is an HTTP code that means one server invalid to receive a response from another server.