If the selected method is X 'ff ', none of the methods listed by the client are acceptable, and the client MUST close the connection.
如果选择的方法是XFF，那么在客户所列出的方法中没有一个能被接受，客户必须关闭这个连接。
If the selected method is X 'ff ', none of the methods listed by the client are acceptable, and the client MUST close the connection.
如果选择的方法是XFF，那么在客户所列出的方法中没有一个能被接受，客户必须关闭这个连接。
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