FileUploadException - 'Stream ended unexpectedly' when proxy is configured

Hi,

Wicket file upload results HTTP 400 - bad request, when proxy is configured
[Eg: OWASP ZAP]. I am able to reproduce this using the live examples URL -
www.wicket-library.com/wicket-examples-6.0.x/upload/single
<http://www.wicket-library.com/wicket-examples-6.0.x/upload/single>
Can anybody explain this behavior.

1. Installed ZAP tool
2. Start ZAP [starts on 8080 by default, can be changed]
3. Configured proxy in IE [Internet Options -> Connetions -> LAN settings]
4. Access the above given wicket file upload example URL
5. Try uploading a file [try using reasonably big file - between 100KB -
700KB]

Regards,
Rakesh.A