100 Continue

The 100 Continue status code indicates that the initial part of a
request has been received and has not yet been rejected by the
server. The server intends to send a final response after the
request has been fully received and acted upon[1].

When the request contains an Expect header field that includes a
100-continue expectation, the 100 response indicates that the server
wishes to receive the request payload body, as described in
Section 5.1.1[2]. The client ought to continue sending the request and discard the 100 response[3].

If the request did not contain an Expect header field containing the
100-continue expectation, the client can simply discard this interim
response[4].

References

We like to give credit where credit is due. This article contains 2 references with a total of 4 citations.

  1. [1] [3] [4] Fielding, Roy T, And Julian F Reschke. "6.2.1. 100 Continue." Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content, IETF Trust, 1 Jun. 2014, tools.ietf.org/html/rfc7231#section-6.2.1

  2. [2] Fielding, Roy T, And Julian F Reschke. "5.1.1. Expect." Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content, IETF Trust, 1 Jun. 2014, tools.ietf.org/html/rfc7231#section-5.1.1

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