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在使用nginx进行端口转发时，使用了websocket，但出现错误：
websocket: the client is not using the websocket protocol: ‘upgrade’ token not found in ‘Connection’ head
当反向代理或负载平衡器未正确传递WebSocket请求时，就会出现此问题。以下是解决此问题的说明。
For Nginx：
proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection upgrade
For Apache:
<Location /ws> ProxyPass ws://localhost:8000 ProxyPassReverse ws://localhost:8000/