如何在spray/akka中手动抛出HTTP 404未找到异常？

import spray.http.StatusCodes

// ...

def handleRequest: Route = {
  // ...
  if (resourceNotFound) {
    complete(StatusCodes.NotFound, "Resource not found")
  } else {
    // handle the request normally
  }
}

import spray.httpx.SprayJsonSupport._
import spray.json.DefaultJsonProtocol._

// ...

case class ErrorResponse(message: String)

object ErrorResponse {
  implicit val format = jsonFormat1(ErrorResponse.apply)
}

def handleRequest: Route = {
  // ...
  if (resourceNotFound) {
    val errorResponse = ErrorResponse("Resource not found")
    complete(StatusCodes.NotFound, errorResponse)
  } else {
    // handle the request normally
  }
}