build_hsts_header

# File actionpack/lib/action_dispatch/middleware/ssl.rb, line 113
      def build_hsts_header(hsts)
        value = "max-age=#{hsts[:expires].to_i}"
        value << "; includeSubDomains" if hsts[:subdomains]
        value << "; preload" if hsts[:preload]
        value
      end