100 Continue informational status response code
indicates that everything so far is OK and that the client should continue with the
request or ignore it if it is already finished.
To have a server check the request's headers, a client must send
: 100-continue as a header in its initial request
and receive a
100 Continue status code in response before sending the body.
|RFC 7231, section 6.2.1: 100 Continue||Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content|
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