HttpURLConnection以FileNotFoundException（404）而不是401返回响应

Question

My application uses java.net.HttpURLConnection to get a file input stream. Server is using spring boot framework of java. When authentication token is expired spring boot filter is throwing SecurityException & we are setting response code as 401 as follows (Spring boot server side ):

catch (ExpiredJwtException eje) {
            ((HttpServletResponse) servletResponse).setStatus(HttpServletResponse.UNAUTHORIZED);
        }

But at android side we are getting exception FileNotFoundException which represents the 404 & response code as -1. Why am I not able to get the response code as 401 ?

Following code I am using to check the response code (Android side):

urlConnection.connect();

                if(urlConnection.getResponseCode() == HttpURLConnection.HTTP_UNAUTHORIZED) {

                }

                InputStream inputStream = urlConnection.getInputStream();

Answer 1

Try this code.

urlConnection.connect();
InputStream inputStream = null;
if(urlConnection.getResponseCode() == 200) {
    inputStream = urlConnection.getInputStream();
}else
{
    inputStream =  urlConnection.getErrorStream()
}