def send_file(filename, options = {})
         response['X-Sendfile'.freeze] = filename
         options[:filename] ||= File.basename(filename)
         filename = File.open(filename, 'rb'.freeze) # unless Iodine::Rack.public
         send_data filename, options
      end
def send_file(filename, options = {})
         response['X-Sendfile'.freeze] = filename
         options[:filename] ||= File.basename(filename)
         filename = File.open(filename, 'rb'.freeze) # unless Iodine::Rack.public
         send_data filename, options
      end
Same as {#send_data}, but accepts a file name (to be opened and sent) rather then a String.

 See {#send_data} for available options.