module.exports = function getSocketHost (url) {
  // get the host domain
  var regex = /^(?:https?:\/\/|\/\/)?(?:[^@\n]+@)?(?:www\.)?([^\n]+)/
  var host = regex.exec(url)[1]
  var socketProtocol = location.protocol === 'https:' ? 'wss' : 'ws'

  return `${socketProtocol}://${host}`
}