{
    "user":"User",
    "age":16
}

{
    "errorMessage":"Server is not working",
    "action":{
         ...
    }
}

@GET("/screens/home")
Single<HomeResponse> getHome(@Query("langCode") String langCode);

@GET("/screens/home")
Single<Reponse<HomeResponse>> getHome(@Query("langCode") String langCode);