mysocket test
c: http://cs.ecs.baylor.edu/~donahoo/practical/CSockets2/
http://haoningabc.iteye.com/blog/1616472
java: http://haohaoxuexi.iteye.com/blog/1979837
http://bbs.csdn.net/topics/340199431 keepalive
websocket:
java: https://github.com/killinux/Java-WebSocket
html: http://haoningabc.iteye.com/blog/2124605
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