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

Go HTTP Status Constant http.StatusProxyAuthRequired
Python3+ HTTP Status Constant http.client.PROXY_AUTHENTICATION_REQUIRED
Python3.5+ HTTP Status Constant http.HTTPStatus.PROXY_AUTHENTICATION_REQUIRED
Rails HTTP Status Symbol :proxy_authentication_required
Symfony HTTP Status Constant Response::HTTP_PROXY_AUTHENTICATION_REQUIRED

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