res.setContentType("text/plain");
PrintWriter out = res.getWriter();
out.println("Request Headers:");
out.println();
Enumeration enum = req.getHeaderNames();
while (enum.hasMoreElements()) {
String name = (String) enum.nextElement();
String value = req.getHeader(name);
if (value != null) {
out.println(name + ": " + value);
}
}
