Sometimes the method [CopyStream()](https://github.com/xenserver/xenadmin/blob/master/XenModel/XenAPI/HTTP.cs#L307) is hanging and cancellation request is not working. People also write about it on stackoverflow: [Stop hanging synchronous method](https://stackoverflow.com/questions/47551256/stop-hanging-synchronous-method)
Sometimes the method CopyStream() is hanging and cancellation request is not working.
People also write about it on stackoverflow: Stop hanging synchronous method