Req is what identifies the request.
req的功能是标识请求。
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)。
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。
Recall from that discussion that a TGT request contains four data fields: pvno, msg-type, padata, and req-body.
回想在那里的讨论中，TGT请求包含四个数据字段：pvno、msg - type、padata和req - body。
Recall from that discussion that a TGT request contains four data fields: pvno, msg-type, padata, and req-body.
回想在那里的讨论中，TGT请求包含四个数据字段：pvno、msg - type、padata和req - body。
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