How to get cookie for post request?

Question

Java

I implement the following Post-zaros:

url = new URL(url_str);
con = (HttpURLConnection) url.openConnection();
con.setRequestProperty("Content-type", "application/json; charset=utf-8");
con.setRequestProperty("Accept-Charset", "UTF-8");
con.setRequestProperty("Accept", "*/*");
con.setRequestProperty("Accept-Encoding", "gzip");
con.setRequestProperty("User-Agent:", "Android 4.0+");
con.setDoOutput(true);
con.setDoInput(true);
con.setConnectTimeout(13000);
con.setReadTimeout(11000);
con.connect();
Map<String, List<String>> map = con.getHeaderFields();
        for (Map.Entry<String, List<String>> entry : map.entrySet()) {
            System.out.println("Key : " + entry.getKey() +
                    " ,Value : " + entry.getValue());
        }
String cookie = con.getHeaderField("Set-Cookie");

con.getHeaderFields() returns null. What's wrong ?
Maybe I'm getting headers wrong?
Google didn't help.
Can you please tell me how to get the cookie correctly?

Answer 1

The issue was resolved. Server error.