Simple snippet to retrieve a web in an asynchronous manner

Http.scala

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model.{StatusCodes, _}
import akka.http.scaladsl.unmarshalling.Unmarshal
import akka.stream.ActorMaterializer

import scala.concurrent.Future
import scala.util.{Failure, Success, Try}

object Http extends App {

  implicit val system = ActorSystem()
  implicit val materializer = ActorMaterializer()
  implicit val executionContext = system.dispatcher

  request("http://akka.io") onComplete {
    println(_)
  }

  def request(uri: String): Future[Try[String]] = {
    Http().singleRequest(HttpRequest(uri = uri)) flatMap {
      response =>
        response.status match {
          case StatusCodes.OK => Unmarshal(response.entity).to[String].map(Success(_))
          case _ => Unmarshal(response.entity).to[String].map(x => Failure(new Exception(x)))
        }
    }
  }
}