force_ssl_redirect

# File actionpack/lib/action_controller/metal/force_ssl.rb, line 78
    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) && request.respond_to?(:flash)
        redirect_to secure_url, options.slice(*REDIRECT_OPTIONS)
      end
    end