HTTP 411 — Length Required
The request did not specify the length of its content, which is required by the requested resource
When to use it
Use status 411 when this is the correct HTTP response semantic: The request did not specify the length of its content, which is required by the requested resource
Request and response example
GET /protected-resource HTTP/1.1
Host: api.example.com
HTTP/1.1 411 Length Required
Content-Type: application/json
{"error":"Request cannot be completed"}