How can I send binary data from Sinatra?

Question

I want to send binary data from a Sinatra application so that the user can download it as a file.

I tried using send_databut it gives me an undefined

Answer 1

I used something like this:

require 'sinatra'

set :port, 8888
set :bind, '0.0.0.0'
filename = 'my_firmware_update.bin'

get '/' do
    content_type 'application/octet-stream'
    File.read(filename)
end