五、读取HTTP请求头

                "＜TH＞Header Name＜TH＞Header Value");
    Enumeration headerNames = request.getHeaderNames();
    while(headerNames.hasMoreElements()) {
      String headerName = (String)headerNames.nextElement();
      out.println("＜TR＞＜TD＞" + headerName);
      out.println("    ＜TD＞" + request.getHeader(headerName));
    }
    out.println("＜/TABLE＞＼n＜/BODY＞＜/HTML＞");
  }

  public void doPost(HttpServletRequest request,
                     HttpServletResponse response)
      throws ServletException, IOException {
    doGet(request, response);
  }
}