4×× Client Error

407 Proxy Authentication Required

Similar to 401 Unauthorized, but it indicates that the client needs to authenticate itself in order to use a proxy.

The proxy MUST send a Proxy-Authenticate header field¹ containing a challenge applicable to that proxy for the target resource. The client MAY repeat the request with a new or replaced Proxy-Authorization header field².

• ¹ Proxy-Authenticate RFC7235 Section 4.3
• ² Proxy-Authorization RFC7235 Section 4.4
• Source: RFC7235 Section 3.2

407 Code References

Rails HTTP Status Symbol :proxy_authentication_required

Rust HTTP Status Constant http::StatusCode::PROXY_AUTHENTICATION_REQUIRED

Go HTTP Status Constant http.StatusProxyAuthRequired

Symfony HTTP Status Constant Response::HTTP_PROXY_AUTHENTICATION_REQUIRED

Python2 HTTP Status Constant httplib.PROXY_AUTHENTICATION_REQUIRED

Python3+ HTTP Status Constant http.client.PROXY_AUTHENTICATION_REQUIRED

Python3.5+ HTTP Status Constant http.HTTPStatus.PROXY_AUTHENTICATION_REQUIRED

.NET HTTP Status Constant System.Net.HttpStatusCode.ProxyAuthenticationRequired