发布到 akka-http 服务器时"Expected List as JsArray"

Question

我正在尝试在此处创建订单/项目应用程序的轻微变化：https://github.com/akka/akka-http/blob/master/docs/src/test/scala/docs/http/scaladsl/SprayJsonExampleSpec.scala#L51

我正在使用httpie连接到服务器，命令是：

http POST http://localhost:8080/post_an_order items=[]

我收到以下错误：

HTTP/1.1 400 Bad Request
Content-Length: 73
Content-Type: text/plain; charset=UTF-8
Date: Wed, 08 Feb 2017 19:04:37 GMT
Server: akka-http/10.0.3
The request content was malformed:
Expected List as JsArray, but got "[]"

代码为：

import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import akka.http.scaladsl.Http
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._
import spray.json.DefaultJsonProtocol._
import scala.io.StdIn
case class Item(id: Long, name: String)
case class Order(items: List[Item])
object WebServer {
  implicit val system = ActorSystem()
  implicit val materializer = ActorMaterializer()
  implicit val executionContext = system.dispatcher
  implicit val itemFormat = jsonFormat2(Item)
  implicit val orderFormat = jsonFormat1(Order)
  def main(args: Array[String]) {
    val route =
      get {
        pathSingleSlash {
          complete( Item(123, "DefaultItem") )
        }
      } ~
      post {
        path("post_an_order") {
          entity(as[Order]) { order =>
            val itemsCount = order.items.size
            val itemNames = order.items.map(_.name).mkString(", ")
            complete(s"Ordered $itemsCount items: $itemNames")
          }
        }
      }
    val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)
    println("http://localhost:8080/")
    StdIn.readLine()
    bindingFuture.flatMap( _.unbind() ).onComplete( _ => system.terminate() )
  }
}

Answer 1

服务器很好。HTTPie 调用的两个问题：

1. JSON 数组需要 HTTPie 中的:=赋值运算符
2. 需要覆盖"接受"标头才能接收 200。否则，HTTPie将假定Accept:application/json，而Akka-HTTP将返回406 - Not Acceptable错误。

http POST http://localhost:8080/post_an_order Accept:text/plain items:=[]