static int add_xtinyproxy_header (struct conn_s *connptr)
{
        assert (connptr && connptr->server_fd >= 0);
        return write_message (connptr->server_fd,
                              "X-Tinyproxy: %s\r\n", connptr->client_ip_addr);
}
static int add_xtinyproxy_header (struct conn_s *connptr)
{
        assert (connptr && connptr->server_fd >= 0);
        return write_message (connptr->server_fd,
                              "X-Tinyproxy: %s\r\n", connptr->client_ip_addr);
}