Explain HTTP error codes 100 series.
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| 100 |
Continue |
The client SHOULD continue with its request. This interim response is used to inform
the client that the initial part of the request has been received and has not yet
been rejected by the server. The client SHOULD continue by sending the remainder
of the request or, if the request has already been completed, ignore this response.
The server MUST send a final response after the request has been completed.
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| 101 |
Switching Protocols |
The server understands and is willing to comply with the client's request,
via the Upgrade message header field, for a change in the
application protocol being used on this connection. The server will switch protocols
to those defined by the response's Upgrade header field immediately after the empty
line which terminates the 101 response.
The protocol SHOULD be switched only when it is advantageous to do so.
For example, switching to a newer version of HTTP is advantageous over
older versions, and switching to a real-time, synchronous protocol might
be advantageous when delivering resources that use such features.
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