HTTP 100 — Continue
The server has received the request headers and the client should proceed to send the request body
When to use it
Use status 100 when this is the correct HTTP response semantic: The server has received the request headers and the client should proceed to send the request body
Request and response example
POST /uploads HTTP/1.1
Host: api.example.com
Expect: 100-continue
HTTP/1.1 100 Continue