HOW TO FIND Web Server ...?

Question

when i try to find web server (tomcat ) on my computer with the program below ... iam getting the output like this ....
Web server of sitehttp://localhost:8080is null
note : my tomcat is running at http://localhost:8080
can anyone help me out .....
import java.io.*;
import java.net.*;
public class findServer
public static void main(String a[])
try
URL u=new URL(a[0]);
System.out.println("Web server of site"+a[0]+"is-"+u.openConnection().getHeaderField ("Server"));
catch(Exception e)
System.out.println(e);
thanx

Answer 1

The tomcat won't send the "Server" field; it will send you
the "Servlet-Engine" field instead. This should work:
private static final String getWebServerInfo(String url)
  try
    URL u = new URL(url);
    String server = u.openConnection().getHeaderField("Server");
    if(server == null) server = u.openConnection().getHeaderField("Servlet-Engine");
    return server == null ? "Unknown (got null)" : server;
  catch(Throwable t) { return "Unknown (got exception: " + t.toString() +")"; }
}