Upload time-out with Ubuntu One API?

Is there any kind of time-out when uploading a file with the Ubuntu One cloud API (link)?

I have uploaded files < 30MB, but uploading files of size > 90MB get response:

HTTP/1.1 100 Continue

HTTP/1.1 401 UNAUTHORIZED
Date: Wed, 15 Aug 2012 09:20:07 GMT
Server: TwistedWeb/10.0.0
Vary: Cookie,Accept-Encoding
Etag: "<some etag>"
X-Bzr-Revision-Number: 5885
Content-Type: text/html; charset=utf-8
Via: 1.1 files.one.ubuntu.com
Content-Length: 0
Connection: close

Referring to this question, there is no filesize limit but a time-out is plausible.

Thanks in advance!