Delivering HTTP/2 upload speed improvements

Cloudflare recently improved upload speeds across their network for clients using HTTP/2. They discovered that HTTP/2 upload speeds were sometimes much slower than HTTP/1.1 when the user had high available upload bandwidth. This issue was related to receiver flow control, which differs between HTTP/1.1 and HTTP/2. To address this problem, they implemented autotuning of HTTP/2 request body buffer size based on network conditions. The new feature is now fully deployed in the Cloudflare edge, benefiting customers with improved upload performance for all HTTP/2 connections.

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