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According to the specification, the 502 status code indicates that the server, while acting as a gateway or proxy, received an invalid response from an upstream server. The Occurrence [ edit ]
In HTTP/1.0, as stated in RFC 1945, the TCP/IP connection should always be closed by server after a response has been sent. [ note 3 ] In HTTP/1.1 a keep-alive-mechanism was officially introduced so that a connection could be reused for more than one request/response.