HttpClient POST does not work on Android Device

Question

I am try to POST my phone contacts JSON Array to server via AsyncHttpClient. i get all my contacts from the device and convert it to json array. After debugging i see the AsyncHttpClient does not trigger while on an android device.

The below code works on the GenyMotion Emulator but not on Android device

Tested on Samsung Note 4 and A7, the httpclient.post does not execute. The post Works on Emulator

public void contactsToServer() throws JSONException, UnsupportedEncodingException {

JSONObject listContacts = new JSONObject();
try {
    lstContacts.put("listContacts", JsonContactsArray); 
} catch (JSONException e) {
    e.printStackTrace();
}
String jsonContacts = listContacts.toString();


AsyncHttpClient httpClient = new AsyncHttpClient(true, 80, 443);
StringEntity entity = new StringEntity(jsonContacts);

httpClient.addHeader("hjtyu34", TOKEN);

httpClient.post(mycontext, URL, entity, "application/json", new JsonHttpResponseHandler() {
    @Override
    public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
        super.onSuccess(statusCode, headers, response);
        System.out.println("onSuccess: " + response.toString());                
    }
    @Override
    public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONObject errorResponse) {
        if (statusCode == 404) {
            Toast.makeText(getActivity().getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
        } else if (statusCode == 500) {
            Toast.makeText(getActivity().getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(getActivity().getApplicationContext(), "Server Down", Toast.LENGTH_LONG).show();
        }
    }
});
}