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

The current version of Sinatra has a way to stream data:

get '/' do
  stream do |out|
    out << "It's gonna be legen -\n"
    sleep 0.5
    out << " (wait for it) \n"
    sleep 1
    out << "- dary!\n"
  end
end

Source: http://www.sinatrarb.com/intro#Streaming%20Responses