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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.
NOTE: a RID is the highest logical (loopback) IP address configured on a router, if no logical/loopback IP address is set then the router uses the highest IP address configured on its active interfaces (e.g. 192.168.0.1 would be higher than 10.1.1.2). Usually the router with the second-highest priority number becomes the BDR.
Berkeley sockets originated with the 4.2BSD Unix operating system, released in 1983, as a programming interface.Not until 1989, however, could the University of California, Berkeley release versions of the operating system and networking library free from the licensing constraints of AT&T Corporation's proprietary Unix.