What does HTTP 100 mean?
The server has received the request headers and the client should proceed to send the body.
Common causes and when you see it
Used with the Expect: 100-continue header on large uploads so the client does not send a body the server would reject.
How to fix or handle it
Normally handled automatically by HTTP clients. No action is needed.
Test it yourself
Send a request with the online API tester, inspect the response with the HTTP header checker, or host an endpoint that returns 100 with the mock API generator to see how your app reacts.
HTTP 100 questions
The server has received the request headers and the client should proceed to send the body.
Used with the Expect: 100-continue header on large uploads so the client does not send a body the server would reject.
Normally handled automatically by HTTP clients. No action is needed.