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 that it has not been rejected by the server yet. 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. See [RFC 2068], section 8.2.3 for detailed discussion of the use and handling of this status code.

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