DDoS attacks have always been a major threat to network infrastructure and web applications. Attackers are always creating new ways to exploit legitimate services for malicious purposes, forcing us to constantly research DDoS attacks in our CDN to build advanced mitigations.

https://www.imperva.com/blog/the-ping-is-the-thing-popular-html5-feature-used-to-trick-chinese-mobile-users-into-joining-latest-ddos-attack/