int len=_buffer.length()-7;
int len=_buffer.length()-8;
    private void flushContent() throws IOException    {        if (_content)        {            _content=false;            // get the content length            // -7 bytes            // 4 bytes for the ajp header            // 1 byte for response type            // 2 bytes for the response size            int len=_buffer.length()-7;            // insert the content length in the 5th, and 6th byte            addInt(5,len);            addPacketFooter();            _endp.flush(_buffer);            reset(true);        }    }