Req is what identifies the request.

req的功能是标识请求。

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This function takes two arguments - a request (req) and a response (res).

此函数带有两个参数，一个请求(req)和一个响应(res)。

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The req object constructs the request with open() and sends the request using send(), which blocks until a response is received.

req 对象用 open() 方法构造请求，再用 send() 方法发送请求，这时这个方法会阻塞，直到接收到响应为止。

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