Anti-DDoS Pro supports CNAME back-to-source. That is, a CNAME rather than the IP address is used as the address of the origin. This feature is applicable to Use Anti-DDoS Pro with WAF and CDN and other similar architectures, and supports CNAME access.
You can enable this feature while adding your domain name itself. For this, you must select Origin site domain under Origin IP/ Domain, and enter the required CNAME.
Note: Only one CNAME is supported.