代码安排nodejs+react

1. nodejs

如何启动两个端口， 比如一个一个proxy一个service

const proxy = require('./src/proxy'); //一些变量可以加载起来
const service = require('./src/service');

proxy.start(); //在最外围的不用await. 
service.start();

module.exports.proxy = proxy;
module.exports.service = service;

z在start里面做什么？ 比如开一个httpserver

const _httpServer = http.createServer(app);

const corsOptions = {
  origin: 'http://localhost:3000',
  methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
  preflightContinue: false,
  credentials: true,
};

const start = async () => {
  // confiugraiton of passport is async
  // Before we can bind the routes - we need the passport
  const passport = await require('./passport').configure(); //这里初始化好了passport
  const routes = require('./routes');
  app.use(cors(corsOptions));
  app.use(session({
    secret: 'keyboard cat',
    resave: false,
    saveUninitialized: false,
  }));
  app.use(passport.initialize());
  app.use(passport.session());
  app.use(express.json());
  app.use(express.urlencoded({extended: true}));
  app.use('/', routes);

  await _httpServer.listen(port);

  console.log(`Service Listening on ${port}`);
  app.emit('ready');

  return app;
};

module.exports.start = start;

　　

2. passport是什么

截获请求， 如果用户不存在， 则停止

会调用里面的use方法， cb成功， 则向后传递

https://github.com/jaredhanson/passport/tree/master/lib

3. nodejs中export vs module.exports的区别

https://blog.csdn.net/yanyongtao1/article/details/78970992

load()函数最终返回module.exports;

var load = function(exports,module){

 　　return module.exports;

}

var exported = load(module.exports,module);

也就是说，默认情况下node准备的exports和module.exports实际上指向同一个空对象

不可以exports= {hello:hello}；//对象会被制空

但是可以 export.hello = hello

4. 转发请求 express-http-proxy

https://www.jianshu.com/p/846e8b555ead

proxy(host, options);
options： {
　　forwardPath:fuctoin(){ return '' } 将请求转发。return string
      forwardPathAsync: return new Promise((resovle, reject)=>{
         resolve('');
    }),
      filter: (req, res)=>{ //那些请求可以转发
        return req.method == 'GET';
    }，
    intercept：function(rsp, data, req, res, callback) {
    // rsp - original response from the target 
    data = JSON.parse(data.toString('utf8'));
    callback(null, JSON.stringify(data));
  } //将响应返回给客户端之前
    decorateRequest: function(proxyReq, originalReq) {
    // you can update headers 
    proxyReq.headers['Content-Type'] = 'text/html';
    // you can change the method 
    proxyReq.method = 'GET';
    // you can munge the bodyContent. 
    proxyReq.bodyContent = proxyReq.bodyContent.replace(/losing/, 'winning!');
    return proxyReq;
  } 在请求通过代理转发至目标主机之
     timeout
    https
}