flex blazeds Detected duplicate HTTP-based FlexSessions错误

今天flex + blazeds遇到以下错误:

"Server.Processing.DuplicateSessionDetected"
  faultDetail = (null)
  faultString = "Detected duplicate HTTP-based FlexSessions, generally due to the remote host disabling session cookies. Session cookies must be enabled to manage the client connection correctly."

刚遇到这样的问题　不知道是怎么一回事　上网google 百度了都没有找到解决方法

最后发现问题出现在 RemoteObject的endpoint上,在endpoint的url上多加了反鞋杠

如url本应该是这样的 

http://127.0.0.1/test/messagebroker/amf

但是写成了这样:

http://127.0.0.1//test/messagebroker/amf

就出现以上错误了

请仔细比较两个url有什么不同

http://127.0.0.1/test/messagebroker/amf

http://127.0.0.1//test/messagebroker/amf

问题是解决了　但是是什么原因　现在不清楚　也希望哪位大侠愿望解释下