[Nginx] Nginx实战之反向代理WebSocket的配置实例

upstream wsbackend {
  server 127.0.0.1:8080;
  server 127.0.0.1:8081;
}
server {
  listen  80;
  server_name ws.52itstyle.com;
  location / {
   proxy_pass http://wsbackend;
   proxy_http_version 1.1;
   proxy_set_header Upgrade $http_upgrade;
   proxy_set_header Connection "upgrade";
  }
}

$(function(){
 socket.init();
});
//Nginx反向代理实现websocket
var basePath = "ws://ws.52itstyle.com//acts_competition/";
socket = {
 webSocket : "",
 init : function() {
  if ('WebSocket' in window) {
   webSocket = new WebSocket(basePath+'webSocketServer'); 
  } 
  else if ('MozWebSocket' in window) {
   webSocket = new MozWebSocket(basePath+"webSocketServer");
  } 
  else {
   webSocket = new SockJS(basePath+"sockjs/webSocketServer");
  }
  webSocket.onerror = function(event) {
   //alert("websockt连接发生错误，请刷新页面重试!")
  };
  webSocket.onopen = function(event) {
  };
  webSocket.onmessage = function(event) {
  };
 },
 sendData : function(data) {
  webSocket.send(data);
 },
}

• WebSocket是端对端的，所以当一个代理服务器从客户端拦截一个Upgrade请求，它需要去发送它自己的Upgrade请求到后端服务器，也包括合适的头。
  
• 因为WebSocket是一个长连接，不像HTTP那样是典型的短连接，所以反向代理服务器需要允许连接保持着打开，而不是在它们看起来空闲时就将它们关闭。