According to the TOS of CloudFlare that CDN only support port 80 (native HTTP) and port 443(native HTTPS).
You must change your port 80 to others if you want to use in China. Besides, there is a block on China Telecom that IPV6 port 80 (or like port 8080) can only be accessed in their network.
Preparation
- A domain hosted in the CloudFlare.
- A terminal (Mobile, Router, PC, etc.)