node中间件-代理接口-解决跨域问题

主要逻辑页面

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

const app = express();
const bodyParser =require("body-parser");

// 一定要写到静态资源托管之前
app.use(compression());
app.use(express.static(path.join(__dirname, 'static')));

//解析body参数
app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());

// static里面放是打包后的静态文件
app.get('/', function (req, res) {
  res.sendFile(path.join(__dirname, 'static', 'index.html'));
});

// 匹配路由导航
app.get('/aigc/*', function (req, res) {
  res.sendFile(path.join(__dirname, 'static', 'index.html'));
});

// request模块 实现接口请求（请求实际接口路由）
const requestRequest = (req, zres) => {
  var options = {
      "url": "https://sit.rabbitpre.com.cn" + req.url,
      "method": req.method,
      "headers": { 
        "content-type": "application/json",
        "cookie": req.headers.cookie,
       },
      "body": JSON.stringify(req.body),
      "query": req.query,
  };
  
  const myHttp = new Promise((resolve, reject) => {
    request (options,(err, res, body) => {
      if (err) {
        reject(err);
      } else {
        resolve(body);
      }
    });
  });
  myHttp.then((res, err) => {
    zres.send(res);
  }).catch ((err) => {
    console.error('\x1B[31m%s\x1B[0m', err);
  })
}

// 拦截接口路由，代理到实际接口地址
app.get('/api/*', requestRequest);
app.post('/api/*', requestRequest);

app.listen(9000, () => {
  console.log('服务启动成功：localhost:9000')
});