@get:JvmName("dns")
  val dns: Dns = builder.dns

  @get:JvmName("proxy")
  val proxy: Proxy? = builder.proxy

  @get:JvmName("proxySelector")
  val proxySelector: ProxySelector =
    when {
      // Defer calls to ProxySelector.getDefault() because it can throw a SecurityException.
      builder.proxy != null -> NullProxySelector
      else -> builder.proxySelector ?: ProxySelector.getDefault() ?: NullProxySelector
    }