httpstatuses/contents/codes/407.md

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---
set: 4
code: 407
title: Proxy Authentication Required
references:
"Rails HTTP Status Symbol": ":proxy_authentication_required"
---
The 407 (Proxy Authentication Required) status code is similar to
[401 (Unauthorized)](/401), but it indicates that the client needs to
authenticate itself in order to use a proxy. The proxy MUST send a
Proxy-Authenticate header field ([Section 4.3][2]) 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 field
([Section 4.4][3]).
Source: [RFC7235 Section 3.2][1]
[1]: <http://tools.ietf.org/html/rfc7235#section-3.2>
[2]: <http://tools.ietf.org/html/rfc7235#section-4.3>
[3]: <http://tools.ietf.org/html/rfc7235#section-4.4>