Handling HEAD

• There is no doHead(), instead the service() method calls doGet()
• It then returns only the headers.
• Improve performance with

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorld extends HttpServlet {

  public void doGet(HttpServletRequest req, HttpServletResponse res)
                               throws ServletException, IOException {

    res.setContentType("text/html");

    if (req.getMethod().equals("HEAD")) return;

    //its really a GET.....
  }
}