Set type of service field in IP headers

Akka
,
1

Hi all,
I would to know if there is a way to set the value of the type of service field in the IP header of the packets sent during an http request.
In the documentation I saw that this field that can be set via the
TrafficClass , and since this class extends SocketOption , I tried to pass the traffic class as a socket option to the client connection settings.
Below is a small sample code, where I tried to set the value of the traffic type to 50:

import akka.actor.ActorSystem
import akka.http.scaladsl.settings.{ClientConnectionSettings, ConnectionPoolSettings}
import akka.http.scaladsl.{Http, HttpExt}
import akka.http.scaladsl.model._
import akka.io.Tcp.SO

object SingleRequest {
  def main(args: Array[String]): Unit = {
    implicit val system = ActorSystem()

    val settings: ClientConnectionSettings = ClientConnectionSettings(system).withSocketOptions(Seq(SO.TrafficClass(50)))

    val poolSettings: ConnectionPoolSettings =
      ConnectionPoolSettings(system)
        .withConnectionSettings(settings)

    val http: HttpExt = Http(system)
    val response = http.singleRequest(HttpRequest(uri = "http://localhost:5016"),settings = poolSettings)

  }
}

However, by analyzing the packets coming to the localhost, the type of service field is always zero.

Could someone help me to set this value correctly?
Thank you very much

2

I would have expected what you tried would work, the socket options should be passed along from Akka HTTP to the underlying Akka stream TCP stream/Akka IO machinery in TCPTransport.connectToAddress.

Perhaps you can try put a breakpoint there and see that the TrafficClass is actually among the used socket options and not lost on the way in some surprising way?