gistfile1.scala

val connection = Http(context.system).outgoingConnection("localhost", 8008)
val request =
  RequestBuilding.Get("/repos/mrbrdo/test_repo/pulls")
    .withHeaders(
      RawHeader("Accept", "application/vnd.github.v3+json"))

async[Unit] {
  val response = await(Source.single(request).via(connection).runWith(Sink.head))
  response.status match {
    case status if status.isSuccess() =>
      val result = await(response.entity.getDataBytes().runFold[ByteString](ByteString()) { (a, e) =>
        a ++ e
      })
      println(result.decodeString("utf-8"))
      println("success")
    case _ =>
      println("failure")
  }
}.onFailure { case (exception) =>
  println("Failure:")
  exception.printStackTrace()
}