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import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class MainClass {
public static void main(String args[]) {
URL u;
URLConnection uc;
String header;
try {
u = new URL("http://www.java2s.com");
uc = u.openConnection();
for (int j = 1;; j++) {
header = uc.getHeaderField(j);
if (header == null)
break;
System.out.println(uc.getHeaderFieldKey(j) + " " + header);
}
} catch (MalformedURLException e) {
System.err.println("not a URL I understand.");
} catch (IOException e) {
System.err.println(e);
}
}
}
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