Alibaba Cloud CDN is a global network of servers designed to deliver high-performance, low-latency content to users around the world. It is a cloud-based service provided by Alibaba Cloud, a subsidiary of the Alibaba Group, that enables businesses to accelerate the delivery of their web content, including images, videos, and static files, to end-users.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Tengine is a web server which is based on the Nginx HTTP server.