In addition, application proxy servers can authenticate users.

此外，应用程序代理服务器可以对用户进行认证。

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Proxy Authentication Required You must authenticate with a proxy server before this request can be served.

Proxy Authentication Required用户必须先使用代理服务器进行验证，这样请求才会被处理。

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InfoQ: ADFS have an optional proxy giving users the ability to authenticate in their company domain over the Internet.

InfoQ： ADFS有一个可选的代理选项，可以让用户通过互联网认证公司域名。

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