Re: Request Factory and com.google.appengine.api.datastore.Text type
That's not true. I have a picture uploader that resizes the images on the client side before sending it to the server, so that I don't have to bother about users uploading huge photos directly from their camera. Once the user uses drops a file into the page using Drag&Drop or selects it using an <input type="file">, you can read from it on the client side. This works at least with the current WebKit and Firefox engines, haven't tried it with IE though.
Check out this article: https://developer.mozilla.org/en/Using_files_from_web_applications
To my knowledge, there is no GWT library wrapper for that yet, but it's easy enough to wrap the javascript objects you need with JSNI.
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