Reference
For more on Cloudflare SSL/TLS, refer to these articles:
- TLS protocols
 - Certificate and hostname priority
 - Certificate authorities
 - Browser compatibility
 - Migration guides
 - Certificate pinning
 - Certificate statuses
 - Validity periods and renewal
 - Features and plans
 - Cloudflare and CVE-2019-1559
 - PCI compliance and vulnerabilities mitigation