Rails devise 对xls文件访问401异常的Redirect处理

1.\config\initializers\devise.rb

config.navigational_formats = ["*/*", :html,:xls]

config.warden do |manager|
　　manager.failure_app = CustomFailure
end

2.\lib\autoloads\custom_failure.rb

class CustomFailure < Devise::FailureApp
  def redirect_url
    #return super unless [:worker, :employer, :user].include?(scope) #make it specific to a scope
    new_user_session_url(:subdomain => 'secure')
  end

  # You need to override respond to eliminate recall
  def respond

    if http_auth?
      http_auth
    else
      redirect
    end
  end
end

3.\config\application.rb

config.autoload_paths += %W(#{config.root}/lib/autoloads)