<% 
  Enumeration e = request.getHeaderNames();
  while (e.hasMoreElements()) { 
    String headerName = (String) e.nextElement(); 
    Enumeration f = request.getHeaders(headerName); 
    while (f.hasMoreElements()) { 
%>
<%= headerName %>:<%= f.nextElement() %>
<%
    } 
  } 
%>