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The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API). 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. 503 Service Unavailable
Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available. A server may send multiple 182 responses to update progress of the queue. [1]: §21.1.4 183 Session Progress This response may be used to send extra information for a call which is still being set up. [1]: §21.1.5
The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248. A server capable of replying with an Enhanced Status Code MUST preface (prepend) the Text Part of SMTP Server responses with the Enhanced Status Code followed by one or more spaces.
Help message. Explains how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user. 215: NAME system type. Where NAME is an official system name from the registry kept by IANA. 220: Service ready for new user. 221: Service closing control connection. Logged out if appropriate. 225
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503 may refer to: 503 (number) 503, a year; 503, a track by Hans Zimmer on the Angels & Demons soundtrack; 503 Service Unavailable, an HTTP status code; Area code 503, a North American telephone area code in northwestern Oregon; BMW 503, a grand tourer; Fiat 503, a small family car; Country code +503, for El Salvador
Request: POST https://en.wikipedia.org from 127.0.0.1 Forwarded for: 192.0.2.16 Error: 503, Backend fetch failed at 13:31, Wednesday, January 22, 2025 That message gives the impression that the web servers are "too busy" to respond, but often is caused by the complexity of the page that it needs to display.
Definition 406 Not Acceptable: The HTCPCP server is unable to provide the requested addition for some reason; the response should indicate a list of available additions. The RFC observes, "In practice, most automated coffee pots cannot currently provide additions." 408 Request Timeout