ata.  The application
        reads at most <tt>FCGI_DATA_LENGTH</tt> bytes from this stream
        before receiving the end-of-stream indication.<p>
    <li>
        The Filter application sends CGI/1.1 <tt>stdout</tt> data to the Web
        server over <tt>FCGI_STDOUT</tt>, and CGI/1.1 <tt>stderr</tt> data
        over <tt>FCGI_STDERR</tt>.  The application sends these
        concurrently, not one after the other.  The application must
        wait to finish reading <tt>FCGI_STDIN</tt> before it begins