Expire time = ffffffff ?

Hi all,

    After upgraded to 1.1beta12, I found something strange in the swap log.
    see:

00002360 327c1336 ffffffff 32522bcc 10018 http://home.netscape.com/assist/ima
ges/assistance.jpg

    I know the first col is fileid, 2nd: timestamp, 3rd: expires, 4th: lastmod.
    But why my expires time is always set to the max (ffffffff) ? I don't think
    I have anything wrong in my configuration.

    refresh_pattern 127\.0\.0\.1 0 0% 0
    refresh_pattern ^http:// 1080 40% 32400
    refresh_pattern ^ftp:// 720 30% 21600
    refresh_pattern ^gopher:// 360 20% 10800

    Does anybody has the same problem?
    Thankx!!

--
Alex Lau