How to get network response even status code not 200

Question

I using API for login, if login success it return code 200 with respone. and if incorrect email or password will return code 401 with json object contain errors the problem is that I want to get the network response even the request code not equal 200 like the image

but volley throw exception BasicNetwork.performRequest: Unexpected response code 401

here is my code

public interface OnResponse{
    void onResponse(JSONObject response) throws Exception;
    void onErrorResponse(VolleyError volleyError);
}//OnResponse



public static void newRequest(Context context, String url, final Map<String, String>params, final OnResponse onResponse){
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    RequestQueue queue = Volley.newRequestQueue(context);
    //
    //onErrorResponse()
    //onResponse()
    StringRequest stringRequest = new StringRequest(Request.Method.POST, url, response -> {
        // - - - - - - - - - - - - - - - - - - - - -
        try {
            JSONObject object = new JSONObject(response);
            onResponse.onResponse(object);
        } catch (Exception e) {
            Log.e(TAG, "FLAG-1");
            e.printStackTrace();
        }
        // - - - - - - - - - - - - - - - - - - - - -
    }, error -> {
        Log.e(TAG, "FLAG-2");
        onResponse.onErrorResponse(error);
    }){
        @Override
        protected VolleyError parseNetworkError(VolleyError volleyError) {
            volleyError.printStackTrace();
            Log.e("zxc", volleyError.getMessage()+"");
            Log.e("zxc", volleyError.getLocalizedMessage()+"");
            return super.parseNetworkError(volleyError);
        }
    };
    //
    stringRequest.setParams(params);
    stringRequest.setShouldCache(false);
    queue.add(stringRequest);
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
}//newRequest()`

Answer 1

If the network status code is other than 4xx or 5xx, Volley returns the response in the onErrorResponse as VolleyError. The response is received as a byte array so, you need to parse it to read the error and the message keys.

Below is a trimmed version of the required code.

final String failAuthError = new String(volleyError.networkResponse.data, Charset.forName("UTF-8"));
ErrorResponse errorResponse = new Gson().fromJson(failAuthError, ErrorResponse.class);
Log.e(TAG, "Error Status: " + errorResponse.error);
Log.e(TAG, "Error Message: " + errorResponse.message);

and ErrorResponse is a custom class with error and message variables.

class ErrorResponse {
    @Expose
    @SerializedName("error")
    String error;

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

Answer 2

You can extract response data from VolleyError.

@Override
public void onErrorResponse(VolleyError error) {
   NetworkResponse networkResponse = error.networkResponse;
   if (networkResponse != null && networkResponse.data != null) {
   String jsonError = new String(networkResponse.data);
   // Print Error!
    }
 }

Answer 3

VolleyError has the networkResponse attribute, it contains the response.

This is an example: String response = new String(error.networkResponse.data);

Answer 4

Simply override parseNetworkResponse in newRequest() method like below

StringRequest request = new StringRequest(Method.GET,
            <your url>,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    //handle response
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    //handle error
                }
            }) {

        @Override
        protected Response<String> parseNetworkResponse(NetworkResponse response) {
            int mStatusCode = response.statusCode;
            return super.parseNetworkResponse(response);
        }
    };