I'm also experiencing URLSessionDataTask timeouts when using QUIC. In my case, they start happening at around 85 parallel calls. I'm not using Cloudflare but tested it with two different operating systems on the server side (latest Debian and FreeBSD) and two different server softwares (latest Nginx and HAProxy). The iOS version is currently 16.6, and it was also happening on the previous iOS 16.x releases. When switching to HTTP/2 while keeping all other parts the same - it works rock solid.
eofster
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