100
Continue
1xx · Informational
The server has received the request headers and the client should proceed to send the body.
What does HTTP 100 Continue mean?
An interim response that tells the client the initial part of the request was received and it should continue sending the request body. It is typically used with the Expect: 100-continue header to avoid sending a large body the server would reject.
1xx responses are provisional — they tell the client the request was received and the process is continuing. They are rarely seen directly in everyday web development.
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