我使用express生成器创建了一个简单的express应用程序，当在dev上启动时，它在localhost:3000上运行良好。

但是，当我使用 eb 命令 git aws.push 将其推送到弹性 beanstalk 时，我在生产服务器上收到 502 错误。

查看日志，我得到的错误是：

2014/04/01 19:29:40 [error] 24204#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.178, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8081/", host: "macenvexp-env-hqv9ucmzev.elasticbeanstalk.com"
2014/04/01 19:29:40 [error] 24204#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.178, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8081/favicon.ico", host: "macenvexp-env-hqv9ucmzev.elasticbeanstalk.com"

我使用默认的nginx配置。当我在没有Express的情况下运行node.js示例应用程序时，它运行得很好。下面是app.js中的express代码:

var express = require('express');
var http = require('http');
var path = require('path');
var favicon = require('static-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var routes = require('./routes');
var users = require('./routes/user');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(favicon());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(app.router);

app.get('/', routes.index);
app.get('/users', users.list);

/// catch 404 and forwarding to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

/// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.render('error', {
        message: err.message,
        error: {}
    });
}); 


module.exports = app;

下面是package.json文件：

{
  "name": "macEnvExp",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "DEBUG=macEnvExp node bin/www"
  },
  "dependencies": {
    "express": "~3.4.8",
    "static-favicon": "~1.0.0",
    "morgan": "~1.0.0",
    "cookie-parser": "~1.0.1",
    "body-parser": "~1.0.0",
    "debug": "~0.7.4",
    "jade": "~1.3.0"
  }
}

这里是bin/www：

#!/usr/bin/env node
var debug = require('debug')('my-application');
var app = require('../app');
app.configure(function(){
app.set('port', process.env.PORT || 3000);
});
console.log(app.get('port'));
var server = app.listen(app.get('port'), function() {
  debug('Express server listening on port ' + server.address().port);
});