Quick proxy to illustrate the use of the content-type to fix extra characters in non utf-8 encoding of Copyright ©

add_utf8_encoding.js

const http = require('http')
const httpProxy = require('http-proxy')

const options = {
  target: 'https://free.co.uk'
}

const proxy = httpProxy.createProxyServer({
  secure: false,
  changeOrigin: true,
  target: 'http://www.cloudflare.com'
})

proxy.on('proxyRes', function (proxyRes, req, res) {
  // A very blunt approach
  // set the encoding to utf-8 to avoid the extra character
  // Copyright © 2019-2020 with content-type: text/html
  // Copyright © 2019-2020 with content-type text/html; charset=utf-8
  if (proxyRes.headers['content-type'] === 'text/html') {
    proxyRes.headers['content-type'] = 'text/html; charset=utf-8'
  }
})

const requestListener = function (req, res) {
  proxy.web(req, res, options)
}

const server = http.createServer(requestListener)

server.on('error', err => {
  console.log('Server error: \n', err)
})

proxy.on('error', (err, req, res) => {
  console.log('Proxy server error: \n', err)
  res.writeHead(500, JSON.stringify(err.message))
  res.end()
})

server.listen(3000, () => {
  console.log('listening on port ' + 3000)
})