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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.
This setup allows integration with Windows login processes and supports various authentication methods like Extensible Authentication Protocol, which uses certificates for secure authentication, and PEAP, creating a protected environment for authentication without requiring client certificates.
The packet is sent with Header Checksum containing the resulting value. When a packet arrives at a router or its destination, the network device recalculates the checksum value of the header, now including the Header Checksum field. The result should be zero; if a different result is obtained, the device discards the packet.
Instead it must be sent to the default gateway for further routing to their ultimate destination. In this example, the default gateway uses the IP address 192.168.4.1, which is resolved into a MAC address with ARP in the usual way.