HTTP Status Code 100

100 Continue

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.

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 body¹. The client ought to continue sending the request and discard the 100 response.

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

• ¹ Expect RFC7231 Section 5.1.1
• Source: RFC7231 Section 6.1.1

100 Code References

Rails HTTP Status Symbol :continue

Go HTTP Status Constant http.StatusContinue

Symfony HTTP Status Constant Response::HTTP_CONTINUE

Python2 HTTP Status Constant httplib.CONTINUE

Python3+ HTTP Status Constant http.client.CONTINUE

Python3.5+ HTTP Status Constant http.HTTPStatus.CONTINUE