er over <tt>FCGI_PARAMS</tt>.
        Filter applications receive two Filter-specific variables:
        <tt>FCGI_DATA_LAST_MOD</tt> and <tt>FCGI_DATA_LENGTH</tt>.<p>
    <li>
        Next the Filter application receives CGI/1.1 <tt>stdin</tt> data from
        the Web server over <tt>FCGI_STDIN</tt>.  The application receives
        at most <tt>CONTENT_LENGTH</tt> bytes from this stream before
        receiving the end-of-stream indication.  (The application
        receives less than <tt>CONTENT_LENGTH</