[squid-users] squid receives (null) instead of http

Hi,

Recently I see lots of the following in my squid logs

1259130624.131 0 89.42.191.44 NONE/400 3172 GET
(null)://example.com/Contab/Rapoarte/Rapoarte_obisnuite.asp?strCategorie=ContPart
- NONE/- text/html

1259141404.195 0 89.122.203.185 NONE/400 3200 POST
(null)://example.com/Contab/NoteContabile/NoteContabUpd.asp?op=MODPOZ&NotaContabId=185
- NONE /- text/html

Squid is: Squid Cache: Version 3.1.0.14-20091120 on Ubuntu Server 9.04
x86 and the clients are Windows mostly with IE8 but also with older IE,
Opera and Firefox.

Squid is acting as a reverse proxy in this case and it has worked like
that for at least an year now. Only recently I started seeing these kind
of errors. The client receives the usual squid error and a client
refresh solves it in general.

Regards,

Arthur