Java URLConnection .getHeaderFieldKey (int n)

public String getHeaderFieldKey(int n)

import java.net.URL;
import java.net.URLConnection;
/*from  w w  w . ja va2s . c o  m*/
public class Main {
  public static void main(String[] argv) throws Exception {
    URL url = new URL("http://java2s.com");
    URLConnection conn = url.openConnection();

    for (int i = 0;; i++) {
      String headerName = conn.getHeaderFieldKey(i);
      String headerValue = conn.getHeaderField(i);
      System.out.println(headerName);
      System.out.println(headerValue);

      if (headerName == null && headerValue == null) {
        System.out.println("No more headers");
        break;
      }
    }
  }
}