HTTP 101 — Switching Protocols
The requester has asked the server to switch protocols and the server has agreed to do so
When to use it
Use status 101 when this is the correct HTTP response semantic: The requester has asked the server to switch protocols and the server has agreed to do so
Request and response example
POST /uploads HTTP/1.1
Host: api.example.com
Expect: 100-continue
HTTP/1.1 101 Switching Protocols