Displaying all the header information in the servlet

public Enumeration getHeaderNames()

public String getHeader(String headerName)

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

public class ShowHeaders extends HttpServlet {

  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
    throws IOException, ServletException {
      response.setContentType("text/html");
      PrintWriter out = response.getWriter();
      
      out.println("HTTP headers sent by your client:<br>");
      
	Enumeration enum = request.getHeaderNames();
        while (enum.hasMoreElements()) {
        String headerName = (String) enum.nextElement();
        String headerValue = request.getHeader(headerName);
        out.print("<b>"+headerName + "</b>: ");
        out.println(headerValue + "<br>");
      }
      
  }
}