Non-blocking single transport pattern: in this invocation pattern, you achieve a non-blocking call using only a single transport connection underneath.
非阻塞单传输模式：在此调用模式中，只使用下面的一个传输连接获得非阻塞调用。
Because the remote service call is asynchronous and non-blocking, the GWT client does not wait for a response from the service.
因为远程服务调用是异步的、非阻塞的，所以GWT客户机并不等待服务的响应。
And if the Web Service client needs to have non-blocking (still with single transport connection), then the client should use AsyncCall instead of Call.
如果Web服务客户机需要非阻塞调用(仍然使用单个传输连接)，则Client应该使用AsyncCall，而非Call。
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