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In Genie I want to stream an mp4 video file for a GET request to a route "/video"

1. I define a route in routes.jl to handle a request

route("/video") do
  # How do I stream a video file from here?
  # The response should serve:
  # "Content-Type": "video/mp4", and 
  # "Content-Length":length_of_the_video
end

Please suggest.

It was easy to figure out from examples and docs, how to serve HTML, markdown etc.