module ActiveStorage::FileServer

def serve_file(path, content_type:, disposition:)
  ::Rack::Files.new(nil).serving(request, path).tap do |(status, headers, body)|
    self.status = status
    self.response_body = body
    headers.each do |name, value|
      response.headers[name] = value
    end
    response.headers.except!("X-Cascade", "x-cascade") if status == 416
    response.headers["Content-Type"] = content_type || DEFAULT_SEND_FILE_TYPE
    response.headers["Content-Disposition"] = disposition || DEFAULT_SEND_FILE_DISPOSITION
  end
end