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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
The request was received, continuing process. 2XX (successful) The request was successfully received, understood, and accepted. 3XX (redirection) Further action needs to be taken in order to complete the request. 4XX (client error) The request contains bad syntax or cannot be fulfilled. 5XX (server error) The server failed to fulfill an ...
A de facto standard for identifying the originating protocol of an HTTP request, since a reverse proxy (or a load balancer) may communicate with a web server using HTTP even if the request to the reverse proxy is HTTPS. An alternative form of the header (X-ProxyUser-Ip) is used by Google clients talking to Google servers.
The message flows are in general driven by the control-point asking for units and the server granting them. The message may also be generated by other diameter applications, such as NASREQ (RFC4005) for sessions that are time/usage-limited. The following diagram shows a simplified message flow for a session using quota grants.
A 403 status code can occur for the following reasons: [4] Insufficient permissions: The most common reason for a 403 status code is that the user lacks the necessary permissions to access the requested resource.
The "R" (Request) bit – If set, the message is a request. If cleared, the message is an answer. The "P" (Proxiable) bit – If set, the message MAY be proxied, relayed or redirected. If cleared, the message MUST be locally processed. The "E" (Error) bit – If set, the message contains a protocol error, and the message will not conform to the ...
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Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative may be provided.