前端用React開發(fā)完成后，想試著前后端分離部署。于是用了koa2和http-proxy-middleware想實(shí)現(xiàn)代理。const Koa = require('koa')const path = require('path')const proxy = require('http-proxy-middleware')const static = require('koa-static')const fs = require('fs')const app = new Koa()app.use(async (ctx, next) => {    if(ctx.url.startsWith('/v1')) {        return proxy({            target: 'http://localhost:8080', // 服務(wù)器地址            changeOrigin: true,            secure: false,            pathRewrite: {                '^/v1' : '/mobile/v1'            }        })(ctx.req, ctx.res, next)    }    return next()})app.use(static(path.join(__dirname, './project/build')))app.use(async (ctx) => {    ctx.body = fs.readFile('./project/build/index.html')})app.listen(3000, () => {    console.log('Listening 3000...')});后端已經(jīng)收到了該請(qǐng)求并返回了數(shù)據(jù)，然而，在瀏覽器該接口卻報(bào)錯(cuò)404后臺(tái)環(huán)境也報(bào)錯(cuò)：請(qǐng)問(wèn)如何改進(jìn)？謝謝！