我将node js应用程序部署到AWS EBS。当我运行应用程序时，我得到错误"502坏网关" nginx/1. 6. 2。这是我在日志中发现的。
env.elasticbeanstalk.com/* 86连接（）失败（111：连接被拒绝），客户端：www.example.com，服务器：，请求："GET/HTTP/1.1"，上游：172.31.4.86"示例网站" "GET / HTTP/1.1", upstream: " http://127.0.0.1:8081/ ", host: "clinicaltrials-env.elasticbeanstalk.com"
这是我的package.json文件

{
"name": "Clinical_Trial_Analytics",
"version": "1.3.2",
"private": true,
"scripts": {
    "start": "node main.js"
  },
"dependencies": {
    "express": "3.0.6",
    "stylus": "0.31.0",
    "jade": "0.27.7",
    "mongodb": "1.2.7",
    "moment" : "1.7.2",
    "emailjs": "0.3.3",
    "json2html": "1.0.0"
},
"engines": {
    "node": "0.12.0",
    "npm":  "1.1.65"
}
}

这是我的main.js文件

var express = require('express');
var http = require('http');
var app = express();

app.configure(function(){
app.set('port', process.env.PORT || 8080);
app.set('views', __dirname + '/server/views');
app.set('view engine', 'jade');
app.locals.pretty = true;

app.use(express.bodyParser());
app.use(express.cookieParser());
app.use(express.session({ secret: 'super-duper-secret-secret' }));
app.use(express.methodOverride());
app.use(require('stylus').middleware({ src: __dirname + '/client' }));
app.use(express.static(__dirname + '/client'));
});

app.configure('development', function(){
app.use(express.errorHandler());
});

require('./server/router')(app);

http.createServer(app).listen(app.get('port'), function(){
console.log("Clinical Trials server listening on port " +  app.get('port'));
})

这个问题我想不出来，是节点版本的问题还是其他的问题？先谢谢了。