AkkaHttpClientSample.scala

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.ActorMaterializer

import scala.concurrent.ExecutionContext.Implicits.global

object AkkaHttpSample extends App {

  implicit val system = ActorSystem()
  implicit val materializer = ActorMaterializer()

  val f = Http().singleRequest(HttpRequest(uri = "https://jp.stanby.com/"))

  f.foreach { res =>
    Unmarshal(res.entity).to[String].foreach { s =>
      println(s)
      system.terminate()
    }
  }

}