[jQuery] jquery form, IE issues

[jQuery] jquery form, IE issues


I'm using jquery form plugin (http://www.malsup.com/jquery/form/), and
have a simple form that uploads to Amazon S3. Everything works fine in
Firefox, but in IE, neither the success, nor the error handlers are
called when a http 204 response is received.
However, 204 responses from my own test webserver are processed fine.
The obvious difference (to my newbie eyes) between the 204 response
from Amazon S3, and from my test webserver is that the response from
Amazon does not include a Content-type or a Content-length tag in the
http header.
I would appreciate any hints on how to debug this issue on IE, or
suggestions on the common things to check/verify.