Server.scala

import akka.actor.{ActorSystem, Props}
import akka.io.IO
import spray.can.Http
import spray.routing._

object Boot {
  
  def main(args: Array[String]): Unit = {
    implicit val system = ActorSystem("foo")
    val api = system.actorOf(Props[Api], "api")

    IO(Http) ! Http.Bind(api, "0.0.0.0", port = 8080)
  }
}

class Api extends HttpServiceActor with FooRoute {

  def receive: Receive = runRoute {
    pathPrefix("api") {
      foo
    }
  }
}

trait FooRoute extends HttpService {

  val foo: Route = get {
    // http://localhost:8080/api/foo/michal
    path("foo" / Segment) { name =>
      complete {
        s"foo $name"
      }
    } ~ {
      // http://localhost:8080/api/bar
      path("bar") {
        complete {
          "bar"
        }
      }
    }
  }
}