hsts_headers

# File actionpack/lib/action_dispatch/middleware/ssl.rb, line 48
      def hsts_headers
        if @hsts
          value = "max-age=#{@hsts[:expires].to_i}"
          value += "; includeSubDomains" if @hsts[:subdomains]
          { 'Strict-Transport-Security' => value }
        else
          {}
        end
      end