"unparseable HTTP header"

[Steve Snyder <swsnyder@xxxxxxxxxxxxx>]

Seen with Squid 2.6S13 in cache.log.  Whose problem is this, Squid's or 
Yahoo's?

2007/06/03 09:54:22| ctx: enter level  0: 'http://www.yahoo.com/s/595507'
2007/06/03 09:54:22| WARNING: unparseable HTTP header field {al-estate}
2007/06/03 09:54:22| ctx: exit level  0
2007/06/03 09:54:22| WARNING: unparseable HTTP header field {al-estate}