websocket library

websocket library:

1. https://github.com/Theldus/wsServer/blob/master/README.md
1. send_receive.html
2. ./send_receive

Test by wscat:

1. wscat -c ws://10.1.59.109:8080

Just check connection:

1. curl --include \ --no-buffer \ --header "Connection: Upgrade" \ --header "Upgrade: websocket" \ --header "Host: example.com:80" \ --header "Origin: http://example.com:80" \ --header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \ --header "Sec-WebSocket-Version: 13" \ http://example.com:80/