How to get byte array of an online mp4 link on client side ?

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I'm planning to save an online mp4 link to user's local using embedded server. I can do it from input file control. But now I have to do it for online mp4 video.
What I do for file is to send byte array with parts using file.slice method using ajaxrequest as formdata. Then embedded server gets the bytearray and creates the file.
It is ok for file control, but how can I do it for online mp4 video link?
I have implemented mp4handler for nancyfx and it worked.