Retrofit returns null When My API reply 404-CodePudding

I have an API. It returns 404 when it does not data in Database. Retrofit 2 returns null response when my API returns 404 as response code.

Barcode.activity:

LnkBarcodeBaptizeCheckModel lnkModel = new LnkBarcodeBaptizeCheckModel();
                        List<String> bap_barcodes = new ArrayList<String>();
                        bap_barcodes.add(barcode);
                        lnkModel.bap_barcodes = bap_barcodes;Call<LnkBarcodeBaptizeCheckResponseModel> lnkCall = apiInterface.CheckLnkBarcodeBaptizeTable(lnkModel);
                        LnkBarcodeBaptizeCheckResponseModel lnkResponse = new MainAynscTask<LnkBarcodeBaptizeCheckResponseModel>().execute(lnkCall).get();

Client:

private static Retrofit retrofit = null;

public static Retrofit getClient() {

    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();

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

    retrofit = new Retrofit.Builder()
            .baseUrl("http://localserver/IndustrialApplicationsAPI/api/")
            .addConverterFactory(GsonConverterFactory.create(gson))
            .client(client)
            .build();



    return retrofit;
}

}

Post method:

@POST("CuringPhase/CheckLnkBarcodeBaptizeTable")
Call<LnkBarcodeBaptizeCheckResponseModel> CheckLnkBarcodeBaptizeTable(@Body LnkBarcodeBaptizeCheckModel trcModel);

Retrofit Call:

public class MainAynscTask<T> extends AsyncTask<Call<T>, Void, T> {

@Override
protected T doInBackground(Call<T>... call) {
    T responseModel = null;
    try {
        responseModel = call[0].execute().body();
    } catch (IOException e) {
        System.out.println("Call error: "   e.getLocalizedMessage());
    }
    return responseModel;
}

@Override
protected void onPostExecute(T result) {
    super.onPostExecute(result);
    //how i will pass this result where i called this task?
}

}

Actually, I get response but It does not parsing.

{"responseCode":404,"data":[],"error":{"errorCode":404,"errorDesc":"Not found!"}} <-- END HTTP (81-byte body)

API Response:
{
  "responseCode": 404,
  "data": [

  ],
  "error": {
    "errorCode": 404,
    "errorDesc": "Not found!"
  }
}

What is the reason?

By the way, It parses the response when I just change the response code to 200.

CodePudding user response：

It may be because of some parsing issue.

If you can share your code than it will be helpful in digging out the cause of error.

CodePudding user response：

Response code 404 means that app was able to communicate with a given server, but the server could not find what was requested. Might I suggest that you take a look at your api request parameters and how is the backend handling those requests

Edited:

You can parse your error response(if you are sending one) by using JSONObject

JSONObject erroObj = new JSONObject(response.errorBody().string());

// or if you have an custom error model class then do this
Gson gson = new Gson();
Type type = new TypeToken<YourErrorResponseClass>() {}.getType();
YourErrorResponseClass errorResponse = 
gson.fromJson(response.errorBody(),type);

I hope this is what you were looking for