# File actionpack/lib/action_dispatch/http/permissions_policy.rb, line 31
def initialize(app)
  @app = app
end

# File actionpack/lib/action_dispatch/http/permissions_policy.rb, line 35
def call(env)
  _, headers, _ = response = @app.call(env)

  return response unless html_response?(headers)
  return response if policy_present?(headers)

  request = ActionDispatch::Request.new(env)

  if policy = request.permissions_policy
    headers[ActionDispatch::Constants::FEATURE_POLICY] = policy.build(request.controller_instance)
  end

  if policy_empty?(policy)
    headers.delete(ActionDispatch::Constants::FEATURE_POLICY)
  end

  response
end