407 / Proxy Authentication Required

“The client must first authenticate itself with the proxy.“ — wikipedia

“This code is similar to 401 (Unauthorized), but indicates that the client must first authenticate itself with the proxy. The proxy MUST return a Proxy-Authenticate header field containing a challenge applicable to the proxy for the requested resource. The client MAY repeat the request with a suitable Proxy-Authorization header field. HTTP access authentication is explained in "HTTP Authentication: Basic and Digest Access Authentication".“ — ietf

407 / code reference(s)
Rails HTTP Status Symbol
:proxy_authentication_required
← return