Resource Not Found Error 404 |
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The 4xx class of status code is intended for cases in which the client seems
to have erred. Except when responding to a HEAD request, the server SHOULD
include an entity containing an explanation of the error situation, and
whether it is a temporary or permanent condition. These status codes are
applicable to any request method. User agents SHOULD display any included
entity to the user.
If the client is sending data, a server implementation using TCP SHOULD be
careful to ensure that the client acknowledges receipt of the packet(s)
containing the response, before the server closes the input connection. If the
client continues sending data to the server after the close, the server's TCP
stack will send a reset packet to the client, which may erase the client's
unacknowledged input buffers before they can be read and interpreted by the
HTTP application.
The server has not found anything matching the Request-URI. No indication is
given of whether the condition is temporary or permanent. The 410 (Gone) status
code SHOULD be used if the server knows, through some internally configurable
mechanism, that an old resource is permanently unavailable and has no forwarding
address. This status code is commonly used when the server does not wish to
reveal exactly why the request has been refused, or when no other response is
applicable.
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