Upload request cancelled

I am trying to upload files using FormPanel and FileUpload. The moment the I submit the form, I see this in the network console:

The request does go to server though and completes successfully but the browser receives no response and my FormPanel.SubmitCompleteHandler is not executed. Any idea why this could be happening? 

It does work sometimes though and once it works, it does not fail thereafter.

Thanks,

Tushar

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