如何在不显式映射结果的情况下转发 WSResponse

Question

所以我有以下操作，我想找到一种直接 return 响应的方法，而不必将其映射到每个可能的状态代码的结果，即跳过 if-else 部分。

def testAction = Action { implicit requestIn => {

   val requestOut : WSRequest = WS.url("test-domain-name:9998")

   val queryString = requestIn.queryString.map { case (k,v) => k -> v.mkString }

   val futureResponse : Future[WSResponse] = requestOut.withQueryString(queryString.toList: _*).get()

   val response = Await.result(requestOut.withQueryString(queryString.toList: _*).get(), 5 seconds)

   if(response.status == 200) {
      Ok(response.xml)
   } else {
      BadRequest(response.body)
   }

}

Answer 1

你不应该等待结果。 Play 框架支持异步操作：

def testAction = Action.async { implicit requestIn =>

    val requestOut: WSRequest = WS.url("test-domain-name:9998")

    val queryString = requestIn.queryString.map { case (k, v) => k -> v.mkString }

    val futureResponse: Future[WSResponse] = requestOut.withQueryString(queryString.toList: _*).get()

    futureResponse

}

和隐式转换：

implicit def Response2Result(response: Future[WSResponse]): Future[Result] = {
  response map {
    response =>
      val headers = response.allHeaders map {
        h => (h._1, h._2.head)
      }
      Result(ResponseHeader(response.status, headers), Enumerator(response.body.getBytes))
  }
}

参见github issue。

Answer 2

Mon Calamari 答案的变体，适用于 Play 2.5

implicit def Response2Result(response: Future[WSResponse]): Future[Result] = {
  response map {
    response =>
      val headers = response.allHeaders map {
        h => (h._1, h._2.head)
      }
      Result(ResponseHeader(response.status, headers), Strict(response.bodyAsBytes, None))
  }
}

Answer 3

这是基于 Barak BN 和 Mon Calamari 的答案的更新答案，适用于 Play 2.6：

import play.api.http.HttpEntity
import play.api.libs.ws.WSResponse
import scala.concurrent.Future

def response2Result(response: Future[WSResponse]): Future[Result] = {
  response map {
    response =>
      val headers = response.headers
        .map { h => (h._1, h._2.head) }
        .filter { _._1.toLowerCase != "content-length" }
      Result(
        ResponseHeader(response.status, headers),
        HttpEntity.Strict(response.bodyAsBytes, Some(response.contentType))
      )
  }
}

主要区别是在 2.6 中将 allHeaders 替换为 headers 并从结果中删除 "content-length" header 因为“显式 Content-Length header 不允许 " by Akka.

同时查看问题 #2239 and PR #4787 中的讨论。

如何在不显式映射结果的情况下转发 WSResponse

How to forward a WSResponse without explicitly mapping the result

scala

playframework