502 Bad Gateway

The server, while acting as a gateway or proxy, received an invalid response from an inbound server it accessed while attempting to fulfill the request.

Source: RFC7231 Section 6.6.3

502 Code references

Go HTTP Status Constant http.StatusBadGateway
Python3+ HTTP Status Constant http.client.BAD_GATEWAY
Python3.5+ HTTP Status Constant http.HTTPStatus.BAD_GATEWAY
Rails HTTP Status Symbol :bad_gateway
Symfony HTTP Status Constant Response::HTTP_BAD_GATEWAY

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