Encode a binary file - like an image, or even an MP3! - into a text URL

I discovered a URI called "data:" today which allows you to encode any amount of file data into a URL. This data could be an image, ascii text, xml data, you name it. You'll have to read the details, but you use it like this:
data:image/jpeg;base64,base_64_encoded_jpeg_goes_here

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