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Cloudflare, Google, and Amazon explain what’s behind the largest DDoS attacks ever
(www.theverge.com)
This is a most excellent place for technology news and articles.
Skip straight to the Google security blag if you want actual details, the verge article has none.
https://cloud.google.com/blog/products/identity-security/how-it-works-the-novel-http2-rapid-reset-ddos-attack