说说如何利用 Node.js 代理解决跨域问题

//代理
const http = require('http');
const request = require('request');

const hostip = '127.0.0.1';
const apiport = 8070;
const imgport = 8071;

//创建 api 代理服务
const apiserver = http.createserver((req, res) => {
  console.log('[apiserver]req.url='+req.url);
  const url = 'http://www.51sjk.com/Upload/Articles/1/0/268/268510_20210708023859786.jpg' + req.url;
  console.log('[apiserver]url='+url);
  const options = {
    url: url
  };

  function callback(error, response, body) {
    if (!error && response.statuscode === 200) {
      //编码类型
      res.setheader('content-type', 'text/plain;charset=utf-8');
      //允许跨域
      res.setheader('access-control-allow-origin', '*');
      //返回代理内容
      res.end(body);
    }
  }

  request.get(options, callback);
});

//监听 api 端口
apiserver.listen(apiport, hostip, () => {
  console.log('代理接口，运行于 http://' + hostip + ':' + apiport + '/');
});

//创建图片代理服务
const imgserver = http.createserver((req, res) => {
  const url = 'https://pic2.zhimg.com/' +req.url.split('/img/')[1];
  console.log('[imgserver]url=' + url);
  const options = {
    url: url,
    encoding: null
  };

  function callback(error, response, body) {
    if (!error && response.statuscode === 200) {
      const contenttype = response.headers['content-type'];
      res.setheader('content-type', contenttype);
      res.setheader('access-control-allow-origin', '*');
      res.end(body);
    }
  }

  request.get(options, callback);


});

//监听图片端口
imgserver.listen(imgport, hostip, () => {
  console.log('代理图片，运行于 http://' + hostip + ':' + imgport + '/')
});