在Akka http中使用marshallers发送一个Json内容的http响应。

I want to send a Http error response with a message in JSON format in the body. I am having trouble using the PredefinedToResponseMarshallers.

我想在正文中发送一条JSON格式的Http错误响应。我在使用预定义的toresponsemarshallers时遇到了麻烦。

I saw an implementation in the Akka docs but I tried a similar thing and it throws a compilation error.

我在Akka文档中看到了一个实现，但是我尝试了一个类似的东西，它抛出了一个编译错误。

import argonaut._, Argonaut._
import akka.http.scaladsl.marshalling.Marshal
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.model.HttpResponse
import akka.http.scaladsl.model.headers._
import akka.http.scaladsl.model.StatusCodes._
import akka.http.scaladsl.marshalling.{ Marshaller, ToResponseMarshaller } 

trait Sample extends Marshallers with Directives { 
     def login(user: Login): CRIX[HttpResponse] = {
        for {
          verification ← verify(user)
          resp = if (verification) {
            HttpResponse(NoContent, headers = Seq(
              .........
            ))
          }//below is my http Error response
          else Marshal(401 → "It is an Unauthorized Request".asJson).to[HttpResponse]
        } yield resp
      }
    }

It gives this compilation error :

它给出了这个编译错误:

Sample.scala:164: type mismatch;
[error]  found   : Object
[error]  required: akka.http.scaladsl.model.HttpResponse
[error]     } yield resp
[error]             ^
[error] one error found
[error] (http/compile:compileIncremental) Compilation failed

I have just started Akka Http so forgive me if it is trivially easy.

我刚开始使用Akka Http，所以请原谅我，如果它很简单。

TL;DR: I want(examples) to learn how to use ToResponseMarshallers in Akka Http.

我想(举例)学习如何在Akka Http中使用ToResponseMarshallers。

1 个解决方案

#1

Method to[HttpResponse] of negative condition takes on Future[HttpResponse]. At the same time positive condition returns HttpResponse.

方法[HttpResponse]对不良情况进行预测[HttpResponse]。同时，正值条件返回HttpResponse。

Try something like (I assume verify takes on Future[T]):

试试这样的方法(我假设将来会有验证):

for {
  verification <- verify(user)
  resp <- if (verification) 
           Future.successful(HttpResponse(NoContent, headers = Seq(.........)) )
         else 
           Marshal(401 → "It is an Unauthorized Request".asJson).to[HttpResponse]
} yield resp

#1