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It's still interesting to explore the concept and think about how its always easier to build stuff exclusively client-side.

I think that's a flawed assertion. It's easy to make an insecure file upload in most server-side web languages. An example in the PHP manual is only a couple of lines of code: http://www.php.net/manual/en/features.file-upload.post-metho...

How easy is it to make a safe client-side solution?