val uri = url.toUri()
      if (uri.host == null) return immutableListOf(Proxy.NO_PROXY)

      // Try each of the ProxySelector choices until one connection succeeds.
      val proxiesOrNull = address.proxySelector.select(uri)
      if (proxiesOrNull.isNullOrEmpty()) return immutableListOf(Proxy.NO_PROXY)

      return proxiesOrNull.toImmutableList()
    }

      }

    fun build(): OkHttpClient = OkHttpClient(this)
  }

  companion object {
    internal val DEFAULT_PROTOCOLS = immutableListOf(HTTP_2, HTTP_1_1)

    internal val DEFAULT_CONNECTION_SPECS =
      immutableListOf(
        ConnectionSpec.MODERN_TLS,
        ConnectionSpec.CLEARTEXT,
      )
  }