title: Uploading base64 jpeg to server from input type=file
body: <p>I have an app with where I can upload files by posting them to the server given I select an image from my computer.</p>
  
  <p>Now I want to extend that to upload an image that isn't on my computer, but in the browser as a base64 string. (its a jpeg I've exported from a canvas).</p>
  
  <p>Is this at all possible to do just in the browser? Or will I have the convert the base64 on the serverside? Only supporting IE9+</p>