407
Client Error
407 Proxy Authentication Required
Authentication is required via a proxy server before this request can be served.
Definition (RFC 9110)
HTTP status code 407 407 Proxy Authentication Required is defined in RFC 9110 (HTTP Semantics), Section 15.5.8 — the current authoritative specification for HTTP semantics, published June 2022, which obsoletes the older RFC 7231 and RFC 2616.
Description
407 Proxy Authentication Required is similar to 401 Unauthorized, but authentication must be performed through a proxy intermediary. The proxy server must include a Proxy-Authenticate header in the response, indicating the authentication scheme.
This is common in corporate environments where all traffic flows through an authenticated proxy.
Common Causes
- Corporate proxy requiring authentication credentials
- Misconfigured proxy settings in the browser or client
- VPN or network gateway with mandatory auth
- Expired proxy credentials
How to Fix
- Configure proxy credentials in browser or HTTP client settings
- Check
Proxy-Authenticateheader for the required auth scheme - Contact network admin if proxy credentials have expired
- Use
Proxy-Authorizationheader in subsequent requests
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