* Returns a domain string like `example.com` for an input domain like `EXAMPLE.COM`
     * or `.example.com`.
     */
    private fun parseDomain(s: String): String {
      require(!s.endsWith("."))
      return s.removePrefix(".").toCanonicalHost() ?: throw IllegalArgumentException()
    }

    /** Returns all of the cookies from a set of HTTP response headers. */
    @JvmStatic
    fun parseAll(
      url: HttpUrl,