[racket] web-server file upload content-disposition headers and IE6

Hi -

it seems that the Content-Disposition header for the file upload is removed
in IE6 (kept in binding:file-filename of course) but preserved in other
browsers that I tested (FF, Chrome).  Is there a specific reason behind the
difference?

Below is the header for FF:

-----------------------------145144739312095878781463263044
Content-Disposition: form-data; name="content"; filename="jelly_fish.jpg"
Content-Type: image/jpeg

Below is the header for IE6:

-----------------------------7da35b2f500e2
Content-Disposition: form-data; name="content";
filename="Z:\Pictures\jelly_fish.jpg"
Content-Type: image/pjpeg

As far as I can tell, the header themselves should not have triggered the
difference.  Thanks,
yc
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