Within each layer, there is a user authorization challenge.

在每一层中都存在一个用户身份验证难题。

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The application requires a user ID and password by sending a 401 challenge, then the browser sends back the user ID and password included in the HTTP authorization header.

该应用程序通过发送一个 401 质询要求用户 ID 和密码，然后浏览器发送回包含在 HTTP 授权 Header 中的用户 ID 和密码。

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