File upload problem

Ok, I’ve got a problem with uploading files larger than 65999 bytes
(exactly - took me a pretty a long time to determine this limit ;
dichotomy isn’t a very fast method you know).

Above this size, my file isn’t event sent to the server since the
connection is reset before the upload actually begins. At least, so it
is in Firefox and IE ; in Safari, the page loading process simply
stalls.

Yes, I DO include the multipart stuff.

I’m using the latest (stable) RoR release with lighttpd 1.4.11.

Any clue ?

Thanks in advance

Replying to myself. It seems to work with WebRick. Looking for some
lighttpd bug report…