hero-forge/server/main.js

const express = require('express')
const httpProxy = require('../lib/http-proxy')
const request = require('request')

const app = express()
const assetsProxy = httpProxy.createProxyServer({
  target: 'https://www.heroforge.com',
  xfwd: false,
  secure: false,
  changeOrigin: true,
  autoRewrite: true,
  protocolRewrite: 'http',
  selfHandleResponse: false,
  mapHeaders(headers) {
    if (headers.referer) {
      const url = new URL(headers.referer)
      url.hostname = 'www.heroforge.com'
      url.protocol = 'https'
      url.port = 443
      headers.referer = url.toString()
    }
    return headers
  }
})

app.use(/^\/$/, (req, res) => {
  request('https://www.heroforge.com', (err, response, body) => {
    if (err) res.status(500).send(err)
    else {
      let html = body
      .replace(/<script[^>]+googletagmanager.*<\/script>/g, '<!-- google tag manager -->')
      .replace(/<img[^>]+facebook.*>/g, '<!-- facebook -->')
      .replace('https://connect.facebook.net/en_US/fbevents.js', '')
      .replace('</body>', '<script type="text/javascript" src="/custom/main.js"></script></body>')
      res.status(200)
      .set('Content-Type', 'text/html')
      .send(html)      
    }
  })
})

app.use('/custom/', express.static('./dist'))

app.use('/', (req, res) => {
  assetsProxy.web(req, res)
})

app.listen(process.env.PORT || 9011)