express转发请求

express

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var express = require('express'); var axios = require('axios'); var qs = require('qs'); var router = express.Router();   const ajax = axios.create({   baseURL: 'http://test.com',   headers: {     'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8',   }, });   ajax.interceptors.request.use((config) => {   if (config.method === 'post') {     config.data = qs.stringify(config.data);   }   return config; });   router.all('/', function(req, res, next) {   res.header('Access-Control-Allow-Origin', '*');    res.header('Access-Control-Allow-Headers', 'Content-Type, Content-Length, Authorization, Accept, X-Requested-With , yourHeaderFeild');    res.header('Access-Control-Allow-Methods', 'PUT, POST, GET, DELETE, OPTIONS');    res.header('Cache-Control', 'no-cache, no-store, must-revalidate');    res.header('Pragma', 'no-cache');    res.header('Expires', '0');      ajax({     method: req.method.toLowerCase(),     url: req.originalUrl,     data: req.body,   }).then(response => {     res.send(response.data);     console.log(response.data);     console.log(req.body);   }).catch(err => {     console.log(err);   });     if (req.method == 'OPTIONS') { res.send(200); } });   module.exports = router;