Resuming partial downloads in MSIE not working

[Chris Woodfield <rekoil@xxxxxxxxxxxxx>]

Hi,

We've noticed that when downloading files through squid 2.7 (as a  
reverse proxy) via MSIE 7 or 8 beta, MSIE will not resume partially- 
completed downloads, which it does normally when downloading from  
other web servers. This appears to be MSIE-specific behavior - the  
second request has a Range:, If-Range:, and If-Unmodified-Since header  
keyed to the point where the original download was cancelled when  
downloading from a "typical" web server, while requests sent to squid  
do not contain these headers.

My best guess is that either because squid's server response is HTTP/ 
1.0, or due to the Via: header (the only two differences between  
response headers from squid, and response headers from the origin  
server), MSIE presumes that the server does not support Range: and  
related headers, and as such does not attempt to use these to resume  
aborted downloads.

Has anyone else noticed this? If so, has anyone come up with a  
workaround at all?

Thanks,

-Chris