Help~ custom page!

I made 100% HTML.
I tried to apply “500 Class Errors” and
“I’m Under Attack Mode™ Challenge” on the page.
However, the below messages appear.

Custom error preview failed
Status code 500 received while fetching template from

target: one of
cf-error:1000s
block:ip-ban
block:rate-limit
block:client-auth
block:basic-sec-captcha
block:country-captcha
block:adv-sec-captcha
block:waf
block:iuam-basic
cf-error:500s
always-online:no-copy
phishing:warn
regulation:block
url: custom template URL to fetch (optional, uses default template when omitted)

Definitely, I inserted
::Cloudflare_ERROR_500S_BOX::와 ::IM_UNDER_ATTACK_BOX:: tokens in the pure HTML file.

I don’t know why this happens. I want to apply this on the page. Can I ask why it doesn’t work?

A post was merged into an existing topic: Question! attack page!