All HTTP status codes

HTTP 407 Proxy Authentication Required

Client Error

Like 401, but the authentication challenge comes from a proxy between you and the target (Proxy-Authenticate header).

Defined in RFC 9110

Common causes

  • Corporate or egress proxy requiring credentials

How to fix it

  1. Configure proxy credentials in the HTTP client

  2. Verify the Proxy-Authorization header reaches the proxy

Related status codes

401 Unauthorized

Authentication is required and was missing or invalid. Despite the name, it means "unauthenticated" — the response includes a WWW-Authenticate challenge.

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