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fix issue 19:#19
原因:之前版本检测异步是否超时是通过轮询遍历请求(500ms)来实现,如果超时时间小于500ms,这种方式是检测不出来的;
修复:每个请求添加一个定时器,定时触发超时逻辑,如果正常收包,那么cancel掉超时任务.