I cannot reproduce the same and cannot see the error since it looks to me like you’ve been missing the A type of the DNS record for your domain pointed to your origin host/server.
May I ask if you are on a free or paid plan?
;QUESTION iranshopgift.ir. IN A
;ANSWER
Record not found!
Thanks for replying
The main website is iranshopgift.ir on free plan
The domain that is restricted by Anti-DDoS is debian.org.speedtest.net.iranshopgift.ir which is in DNS-Only mode for now as soon as I set it to Proxied mode all requests will be blocked by l7ddos
The sequence of events that cause this issue are:
1- Spike or high-load incoming requests
2- Activation of Cloudflare l7ddos
3- After almost 2 days with a low amount of requests per hour all proxied requests are getting blocked by HTTP DDoS Service