Retrofit2使用RxJava的Observable概念处理HTTP 204(无内容响应)情况 [英] Retrofit2 handling HTTP 204 (No Content response ) situation with RxJava's Observable concepts

问题描述

我有一个Web服务，该服务返回一个主题的用户列表，如果该主题没有任何用户，则仅返回HTTP代码204(无内容).

I have a web-service which return a list of users for a topic, if there is no any user for that topic it just returns HTTP code 204( No Content).

这是我为此服务(在Kotlin中)进行的retrofit2呼叫

This is my retrofit2 call for that service (in Kotlin)

@GET("/user/{topic}")
fun getAllUserFor(@Path(value="topic",encoded=true) topic:String) :Observable<List<User>>

我的死刑是:

fun getAllUsers(topic: String, onSuccess: Consumer<List<User>>, onFail:Consumer<Throwable>){

    val api = NetworkLayer.getUserApi()

    api.getAllUserFor(topic)
            .observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.io())
            .subscribe(onSuccess,onFail)

}

可以正常工作，除非没有该主题的用户，因为在没有用户的情况下，服务器将响应代码204，该代码作为异常收到.

Works fine except when there is no users for the topic, because when there is no users server respond with code 204 which received as an exception.

我正在使用ScalarsConverterFactory& GsonConverterFactory以使用Retrofit2解析Json响应.

I'm using ScalarsConverterFactory & GsonConverterFactory to parse the Json response with Retrofit2.

讨论了类似的问题此处，但是他们的服务器仅响应没有任何内容的http代码！在我的情况下，如果有一个或多个用户，则服务器将以Json正文的形式返回用户列表.在没有用户的情况下使用204进行响应，因此我需要处理这两种情况以及其他常见的http错误.

similar issue discussed here but their server responds only with http code without any content! In my case server will return a user list as a Json body when there is one or more users & response with 204 when there is no users, So I need to handle both cases along with other usual http errors.

推荐答案

标准方法是将响应包装在带有adapter-rxjava2依赖项的Result中.

Standard way is wrapping the response in a Result that comes with adapter-rxjava2 dependency.

        @GET("/user/{topic}")
        fun getAllUserFor(@Path(value="topic",encoded=true) topic:String) :Observable<Result<List<User>>>

这样，错误也会传递到onNext，您可以执行以下操作:

this way errors too are delivered to your onNext and you can do something like this:

           api.getAllUserFor(topic)
            .observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.io())
            .subscribe{ result ->
               if(result.isError)
                   //Network Error
               result.response()?.also {
                   if(result.isSuccessful)
                       //Success
                   else{
                       //api error
                   }
            }
          }

更干净，更简洁

通过以下方式检查状态

result.response?.code()

欢呼！

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