HTTP 511 — Network Authentication Required
The client needs to authenticate to gain network access
When to use it
Use status 511 when this is the correct HTTP response semantic: The client needs to authenticate to gain network access
Request and response example
GET /service HTTP/1.1
Host: api.example.com
HTTP/1.1 511 Network Authentication Required
Content-Type: application/json
{"error":"Service failed to process the request"}