Retrofit2: HTTP 404 Tidak Ditemukan

router.route('/hooray/')
    .get(function (req, res) {
        res.status(200).send({ result: true, message: "hooray" })
    })

Ini berfungsi dari Tukang Pos, tetapi dari aplikasi Android saya, saya tidak dapat menjangkau url itu, dan saya tidak tahu alasannya.

Itulah kode (yang disederhanakan):

Antarmuka Layanan

public interface HoorayAPI {
    @GET("hooray/")
    Observable<HoorayResponse> hooray();
}

Kelas Respons khusus saya: HoreResponse

public class HoorayResponse{
    @SerializedName("result")
    @Expose
    private boolean result;

    @SerializedName("message")
    @Expose
    private String message;

    public HoorayResponse(boolean result, String message) {
        this.result = result;
        this.message = message;
    }

    // Getter and setter ...
}

Penelepon

public void foo(){
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("http://192.168.1.12:8080/api/")
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    HoorayAPI service = retrofit.create(HoorayAPI.class);

    Observable<HoorayResponse> hoorayObservable = service.hooray();

    hoorayObservable
            .subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Subscriber<HoorayResponse>() {
                @Override
                public void onCompleted() {}

                @Override
                public void onError(Throwable e) { e.printStackTrace(); }

                @Override
                public void onNext(HoorayResponse response) {
                    System.out.println("Hooray!!!");
                }
            });
}

Saat saya memanggil metode foo(), saya mendapatkan kesalahan ini:

retrofit2.adapter.rxjava.HttpException: HTTP 404 Not Found 
    at retrofit2.adapter.rxjava.OperatorMapResponseToBodyOrError$1.onNext(OperatorMapResponseToBodyOrError.java:43)
    at retrofit2.adapter.rxjava.OperatorMapResponseToBodyOrError$1.onNext(OperatorMapResponseToBodyOrError.java:38)
    at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$RequestArbiter.request(RxJavaCallAdapterFactory.java:173)
    at rx.internal.operators.OperatorSubscribeOn$1$1$1.request(OperatorSubscribeOn.java:80)
    at rx.Subscriber.setProducer(Subscriber.java:211)
    at rx.internal.operators.OperatorSubscribeOn$1$1.setProducer(OperatorSubscribeOn.java:76)
    at rx.Subscriber.setProducer(Subscriber.java:205)
    at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:152)
    at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:138)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
    at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
    at rx.Observable.unsafeSubscribe(Observable.java:8460)
    at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:272)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
    at java.lang.Thread.run(Thread.java:776)

Saya tidak tahu karena kesalahannya: HTTP 404 Not Found. Layanan itu dapat dijangkau dan berfungsi. Saya menulis API layanan untuk login dengan cara yang sangat mirip dengan HoorayAPI, dengan metode POST, dan berhasil. Mengapa ini tidak berhasil di sini? Maksudku, kodenya sepertinya benar.