谷歌网页工具包的一个彗星实现

Overview This gwt-comet library provides an efficient Comet implementation for GWT. This library has been moved to [GitHub](https://github.com/rzschech/gwt-comet) The library implements Comet by streaming messages over long lived HTTP requests to minimise latency and bandwidth requirements and maximise the throughput. This is opposed to many other implementations which use polling or long polling techniques. Features Native Comet implementations specific to browsers removing loading artifacts, reducing latency and bandwidth. Supports string and GWT-serialized messages. Supports deflate compression. Supports heartbeat messages to detect connection issues. Support cross domain connections. (only sub-domain connections are supported in IE). Support for directly sending messages to the HTTP response or establishing a Comet session for message queue based processing.