Our US-based e-commerce site went down during the DDoS despite being behind Cloudflare, since we needed to use a CNAME for our origin. "Serve stale while revali

Our US-based e-commerce site went down during the DDoS despite being behind Cloudflare, since we needed to use a CNAME for our origin. "Serve stale while revalidating" would have completely solved the problem, and I'm incredibly excited that Cloudflare is rolling it out soon - hopefully before the next big attack! Nobody intentionally discontinues a subdomain they own by forcing their origin server's DNS to timeout on responding to the CNAME. (And Cloudflare could always make serve-stale-while-revalidating optional if a user truly does want to have that option.) So "serve stale while revalidating" seems like an unequivocal improvement on the current system.