HTTP 407 Proxy Authentication Required

The client must authenticate with the proxy before the request can proceed.

Use 407 for proxy authentication challenges, not for authentication with the origin server.

httpstatus codeproxyauth

Response (http)

HTTP/1.1 407 Proxy Authentication Required

Use 407 for proxy authentication challenges, not for authentication with the origin server.

Common mistakes

Sending origin-server credentials when the proxy is the party demanding authentication.

Registry reference: RFC9110, Section 15.5.8

Sources