HTTP Status Code 301 - Moved Permanently

The target resource has been assigned a new permanent URI and any future references to this resource ought to use one of the enclosed URIs.

Clients with link-editing capabilities ought to automatically re-link references to the effective request URI to one or more of the new references sent by the server, where possible.

The server SHOULD generate a Location header field in the response containing a preferred URI reference for the new permanent URI. The user agent MAY use the Location field value for automatic redirection. The server's response payload usually contains a short hypertext note with a hyperlink to the new URI(s).

Note: For historical reasons, a user agent MAY change the request method from POST to GET for the subsequent request. If this behavior is undesired, the 307 Temporary Redirect status code can be used instead.

A 301 response is cacheable by default; i.e., unless otherwise indicated by the method definition or explicit cache controls

Wikipedia

This and all future requests should be directed to the given URI.

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HTTP Status Code 402 - Payment Required

This response code is reserved for future use. Initial aim for creating this code was using it for digital payment systems however this is not used currently. Wikipedia Reserved for future use. The original intention was that this code might be used as part of some form of digital cash or micropayment scheme, but that has not happened, and this code is not usually used. As an example of its use, however, Apple's MobileMe service generates a 402 error ("httpStatusCode:402" in the Mac OS X Console log) if the MobileMe account is delinquent.

HTTP Status Code: 103 - Early Hints

The 103 (Early Hints) informational status code indicates to the client that the server is likely to send a final response with the header fields included in the informational response. Typically, a server will include the header fields sent in a 103 (Early Hints) response in the final response as well. However, there might be cases when this is not desirable, such as when the server learns that the header fields in the 103 (Early Hints) response are not correct before the final response is sent. A client can speculatively evaluate the header fields included in a 103 (Early Hints) response while waiting for the final response. For example, a client might recognize a Link header field value containing the relation type "preload" and start fetching the target resource. However, these header fields only provide hints to the client; they do not replace the header fields on the final response. Aside from performance optimizations, such evaluation of the 103 (Early...

HTTP Status Code 406 - Not Acceptable

The target resource does not have a current representation that would be acceptable to the user agent, according to the proactive negotiation header fields received in the request, and the server is unwilling to supply a default representation. The server SHOULD generate a payload containing a list of available representation characteristics and corresponding resource identifiers from which the user or user agent can choose the one most appropriate. A user agent MAY automatically select the most appropriate choice from that list. However, this specification does not define any standard for such automatic selection. This response is sent when the web server, after performing server-driven content negotiation, doesn't find any content following the criteria given by the user agent. The resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the reques...

HTTP Status Codes

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