HTTP 407 Proxy Authentication Required indicates the request was not fulfilled due to a client-side issue (inputs, credentials, permissions, or request shape). It usually requires changing the request or client behavior rather than retrying blindly.
Response includes the status code, standard headers (including Content-Type), and a small diagnostic JSON body describing the request and returned status.
Simulator URL (copy in the app after load — not a normal link):
https://httpstatus.com/api/status/407
Example request:
curl -i "https://httpstatus.com/api/status/407"