res.sendStatus(statusCode)

将响应 HTTP 状态代码设置为 statusCode，并将注册的状态消息作为文本响应正文发送。如果指定了未知状态代码，则响应正文将只是代码编号。

Sets the response HTTP status code to statusCode and sends the registered status message as the text response body. If an unknown status code is specified, the response body will just be the code number.

res.sendStatus(404)

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