force_ssl_redirect

# File actionpack/lib/action_controller/metal/force_ssl.rb, line 76
    def force_ssl_redirect(host_or_options = nil)
      unless request.ssl?
        options = {
          :protocol => 'https://',
          :host     => request.host,
          :path     => request.fullpath,
          :status   => :moved_permanently
        }

        if host_or_options.is_a?(Hash)
          options.merge!(host_or_options)
        elsif host_or_options
          options[:host] = host_or_options
        end

        secure_url = ActionDispatch::Http::URL.url_for(options.slice(*URL_OPTIONS))
        flash.keep if respond_to?(:flash)
        redirect_to secure_url, options.slice(*REDIRECT_OPTIONS)
      end
    end