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504 Gateway Timeout The server was acting as a gateway or proxy and did not receive a timely response from the upstream server. 505 HTTP Version Not Supported The server does not support the HTTP version used in the request. 506 Variant Also Negotiates (RFC 2295) Transparent content negotiation for the request results in a circular reference. [27]
504 Command parameter is not implemented 504 5.5.4 Unrecognized authentication type [3] 521 Server does not accept mail [5] 523 Encryption Needed [6] 530 5.7.0 Authentication required [3] 534 5.7.9 Authentication mechanism is too weak [3] 535 5.7.8 Authentication credentials invalid [3] 538 5.7.11 Encryption required for requested ...
504 Server Time-out The server attempted to access another server in attempting to process the request, and did not receive a prompt response. [1]: §21.5.5 505 Version Not Supported The SIP protocol version in the request is not supported by the server. [1]: §21.5.6 513 Message Too Large
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The date and time that the message was sent (in "HTTP-date" format as defined by RFC 9110) Date: Tue, 15 Nov 1994 08:12:31 GMT: Permanent RFC 9110: Delta-Base: Specifies the delta-encoding entity tag of the response. [11] Delta-Base: "abc" Permanent RFC 3229: ETag: An identifier for a specific version of a resource, often a message digest
Message transfer can occur in a single connection between two MTAs, or in a series of hops through intermediary systems. A receiving SMTP server may be the ultimate destination, an intermediate "relay" (that is, it stores and forwards the message) or a "gateway" (that is, it may forward the message using some protocol other than SMTP).
The gateway is on the same network as end devices. The gateway address must have the same subnet mask as host devices. Each host on the network uses the same gateway. The gateway should have a static address, as changing the address would cause packets not to be delivered. The gateway is typically assigned either the highest or lowest network ...
504 may refer to: 504, a year; Avro 504, a World War 1 era biplane aircraft built by Avro; Peugeot 504, a large family car; Area code 504, telephone code in Louisiana, United States; Section 504 of the Rehabilitation Act, which protects Americans with disabilities from discrimination by any entity that receives Federal funding