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- (void)pause {
    [self.conn cancel];
}

• Cancels an asynchronous load of a request. After this method is called, the connection makes no further delegate method calls. If you want to reattempt the connection, you should create a new connection object.

• 取消一个异步请求，调用此方法后，connection不会再调用代理方法。如果要再次尝试连接，需要建立一个新的连接对象