/**
   * The protocols supported by ALPN on incoming HTTPS connections in order of preference. The list
   * must contain [Protocol.HTTP_1_1]. It must not contain null.
   *
   * This list is ignored when [negotiation is disabled][protocolNegotiationEnabled].
   */
  var protocols: List<Protocol> = immutableListOf(Protocol.HTTP_2, Protocol.HTTP_1_1)
    set(value) {
      val protocolList = value.toImmutableList()