在akka-http中，如何从路由获取List[HttpRequest]？

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import akka.stream.ActorMaterializer

import scala.concurrent.Future

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

val route = path("example") {
  get {
    complete(HttpEntity(ContentTypes.`text/html(UTF-8)`, "<h1>Hello, akka-http!</h1>"))
  }
}

val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)

val requestList: Future[List[HttpRequest]] = extract(_.request.headers) { headers =>
  // 对headers进行处理，生成List[HttpRequest]
  // 返回一个Future[List[HttpRequest]]
  Future.successful(headers)
}

requestList.onComplete {
  case Success(requests) =>
    // 对List[HttpRequest]进行处理
    requests.foreach(println)
  case Failure(ex) =>
    // 处理异常
    println(s"An error occurred: ${ex.getMessage}")
}