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How to build a web server with nodejs

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Release： 2019-01-02 10:02:37

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The content of this article is about the method of building a web server with nodejs. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The front-end often encounters cross-domain problems when obtaining data. This problem can be solved by using nginx as a reverse proxy. However, nginx is a middleware proxy, and the web server addresses deployed by different developers may be different, so the configuration of nginx cannot be universal.

If you can have a client proxy and submit it with the project source code, you can eliminate the need for proxy configurations for different developers. webpack-dev-server is such a client proxy, but if the project does not use webpack, there is no way to use it. Can you imitate and write a simple web server for non-webpack projects? Below is the code, I hope you guys can criticize and correct me.

const request = require('request');
const express = require('express');
const path = require('path');

const app = express();

// 代理配置
const proxyTable = {  
    '/api': {
        target: 'http://localhost/api' 
    }
};
app.use(function(req, res,next) {  
    const url = req.url;  
    if (req.method == 'OPTIONS') {      
      console.log('options_url: ', url); 
      
       //  设置cors 跨域
      // res.header("Access-Control-Allow-Origin", req.headers.origin || '*');
      // res.header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");
      // res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");

      // 设置 cookie
      // res.header("Access-Control-Allow-Credentials", true);
      
      res.status(200).send('OK');     
      return;
    } 
    // console.log('req_url: ', url);
    next();
});

// 设置静态目录
app.use(express.static(path.join(__dirname, 'static')));

app.use('/', function(req, res) {  
      const url = req.url; 
      const proxy = Object.keys(proxyTable);  
      let not_found = true; 
      for (let index = 0; index < proxy.length; index++) {    
          const k = proxy[index];    
          const i = url.indexOf(k);   
          if (i >= 0) {     
              not_found = false;     
              const element = proxyTable[k];      
              const newUrl = element.target + url.slice(i+k.length);
              req.pipe(request({url: newUrl, timeout: 60000},(err)=>{
                  if(err){          
                      console.log('error_url: ', err.code,url);           
                      res.status(500).send('');
                  }     
              })).pipe(res);      
              break;
          } 
      }  
      if(not_found) {    
          console.log('not_found_url: ', url);
          res.status(404).send('Not found');
      } else {    
          console.log('proxy_url: ', url);
      }
});

// 监听端口      
const PORT = 8080;
app.listen(PORT, () => {  
    console.log('HTTP Server is running on: http://localhost:%s', PORT);
});

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PS: static puts static pages

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