docs: function mergeAllowedClientHeaders({ headers, request }) {
    const prohibited = ['accept-encoding', 'connection', 'host', 'origin']
    request.headers = Object.entries(headers).reduce((memo, header) => {
      const [key, val] = header
      if (prohibited.indexOf(key) === -1) memo[key] = val // eslint-disable-line
      return memo
    }, request.headers)
    return request
  }