003/node.js--代理服务(解决跨域问题)

业务描述：
1。web前端发送http请求
2。web后端为https协议
如何保证web前端发送http请求到web后端（跨域问题：域名不一致即跨域），
因此用node.js写了个代理服务，转发前端http请求到后端，再获取后端数据返回给前端。
代码如下所示：
  1 'use strict';
  2 
  3 const express = require('express');
  4 const fs = require('fs');
  5 const path = require('path');
  6 const https = require('https');
  7 const http=require('http');  
  8 const cookieParser = require('cookie-parser');
  9 const bodyParser = require('body-parser');
 10 const app = express();
 11 const url = require("url");
 12 app.use(cookieParser());
 13 app.use(bodyParser.urlencoded({
 14   extended: true
 15 }));
 16 app.use(bodyParser.json());
 17 
 18 //设置跨域访问
 19 app.all('*', function(req, res, next) {
 20   res.header("Access-Control-Allow-Origin", "http://localhost:8080");
 21   res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
 22   res.header('Access-Control-Allow-Credentials', true);
 23   res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
 24   res.header("X-Powered-By", ' 3.2.1');
 25   res.header("Content-Type", "application/json;charset=utf-8");
 26   if (req.method == "OPTIONS") res.send(200);
 27   else next();
 28 });
 29 // Https代理请求
 30 app.post('/rancher', function(req1, res1) {
 31   let urlbody=url.parse(req1.body.url)
 32   console.log("urlbody=========");
 33   console.log(urlbody);
 34   let postData =req1.body.postData||'';
 35   var opts = {
 36       method:req1.body.type,
 37       host:urlbody.host,
 38       port:urlbody.port||'',
 39     //   path:urlbody.path+(urlbody.search||''),
 40       path:urlbody.path,
 41       headers:{
 42           'Content-Type':'application/json',
 43           'Content-Length':postData.length,
 44           'Authorization':'Basic xx',
 45           'Cookie':'',
 46           'Cluster-id':req1.body.cid||''
 47       },
 48       rejectUnauthorized:false
 49   }
 50   console.log("opts=========");
 51   console.log(opts);
 52   var req = https.request(opts,function(res){
 53       var datas = [];
 54       var size = 0;
 55       res.on('data',function(data){
 56           datas.push(data);
 57           size += data.length;
 58       })
 59       res.on('end', function(){
 60           var buff = Buffer.concat(datas, size);
 61           console.log('success'+datas);
 62           res1.send(buff);
 63       })
 64   })
 65   req.on('error',function(err){
 66       console.log('异常,异常原因'+err);
 67   })
 68   if (req1.body.type!="get") {
 69     req.write(postData);
 70   }
 71   req.end();
 72 
 73 });
 74 
 75 // Http代理请求
 76 app.post('/http/rancher', function(req, res1) {
 77   let urlbody=url.parse(req.body.url)
 78   console.log("urlbody=========");
 79   console.log(urlbody);
 80   let postData =req.body.postData||'';
 81   //发送 http Post 请求
 82   var opts = {
 83     method:req.body.type,
 84     host:urlbody.hostname,
 85     port:urlbody.port&&urlbody.port||'',
 86     path:urlbody.path,
 87     headers:{
 88         'Content-Type':'application/json',
 89         'Content-Length':postData.length,
 90         'Authorization':'Basic xx',
 91         'Cookie': 'xx',
 92     },
 93   }
 94   var req=http.request(opts, function(res) {
 95       console.log('Opts:',opts);
 96       console.log('Status:',res.statusCode);
 97       console.log('headers:',JSON.stringify(res.headers));
 98       res.setEncoding('utf-8');
 99       res.on('data',function(chun){
100           console.log('body分隔线---------------------------------
');
101           console.info(chun);
102           res1.send(chun);
103       });
104       res.on('end',function(){
105           console.log('No more data in response.********');
106       });
107   });
108   req.on('error',function(err){
109       console.error(err);
110   });
111   req.write(postData);
112   req.end();
113 });
114 
115 let server = app.listen(8089, function() {
116   let host = server.address().address;
117   let port = server.address().port;
118 
119   console.log('Example app listening at http://%s:%s', host, port);
120 });
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