server_gateway.js

import http from 'http'
import express from 'express'
import proxy from 'express-http-proxy'

const app = express()
const account = httpProxy('http://localhost:3001')
const cart = httpProxy('http://localhost:3002')

app.get('/cart', (req, res, next) => {
  cart(req, res, next)
})

app.get('/account', (req, res, next) => {
  account(req, res, next)
})