How can I handle empty response body with Retrofit 2?

Question

Recently I started using Retrofit 2 and I faced an issue with parsing empty response body. I have a server which responds only with http code without any content inside the

Answer 1

Here is how I used it with Rx2 and Retrofit2, with PUT REST request: My request had a json body but just http response code with empty body.

The Api client:

public class ApiClient {
public static final String TAG = ApiClient.class.getSimpleName();


private DevicesEndpoint apiEndpointInterface;

public DevicesEndpoint getApiService() {


    Gson gson = new GsonBuilder()
            .setLenient()
            .create();


    OkHttpClient.Builder okHttpClientBuilder = new OkHttpClient.Builder();
    HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
    logging.setLevel(HttpLoggingInterceptor.Level.BODY);
    okHttpClientBuilder.addInterceptor(logging);

    OkHttpClient okHttpClient = okHttpClientBuilder.build();

    apiEndpointInterface = new Retrofit.Builder()
            .baseUrl(ApiContract.DEVICES_REST_URL)
            .client(okHttpClient)
            .addConverterFactory(GsonConverterFactory.create(gson))
            .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
            .build()
            .create(DevicesEndpoint.class);

    return apiEndpointInterface;

}

The interface:

public interface DevicesEndpoint {
 @Headers("Content-Type: application/json")
 @PUT(ApiContract.DEVICES_ENDPOINT)
 Observable sendDeviceDetails(@Body Device device);
}

Then to use it:

    private void sendDeviceId(Device device){

    ApiClient client = new ApiClient();
    DevicesEndpoint apiService = client.getApiService();
    Observable call = apiService.sendDeviceDetails(device);

    Log.i(TAG, "sendDeviceId: about to send device ID");
    call.subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Observer() {
        @Override
        public void onSubscribe(Disposable disposable) {
        }

        @Override
        public void onNext(ResponseBody body) {
            Log.i(TAG, "onNext");
        }

        @Override
        public void onError(Throwable t) {
            Log.e(TAG, "onError: ", t);

        }

        @Override
        public void onComplete() {
            Log.i(TAG, "onCompleted: sent device ID done");
        }
    });

}