Code:
telnet www.iugs.ca 80
HEAD /FR/100/default.asp HTTP/1.1
Host: www.iugs.ca
However, I no longer think it's a HEAD request issue, as a one-page index produced the following:
Spidering in progress... [Stop spider]
SITE : http://www.iugs.ca/
Exclude paths :
- @NONE@
Wait...
1:http://www.iugs.ca/FR/100/default.asp
(time : 00:00:19)
No link in temporary table
links found : 1
http://www.iugs.ca/FR/100/default.asp
Optimizing tables...
Indexing complete !
So, I don't really know why you'd be getting 404s.