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by klodolph 2269 days ago
HTTP/2 doesn’t replace the need for UDP at all, not in the slightest. For latency-sensitive applications, it provides no advantages over HTTP that I can tell.

The problem is with TCP, and the problem with TCP is that it prioritizes in-order delivery, and missed packets cause head of line blocking. HTTP/2 is designed to solve head of line blocking, but since it’s built on top of TCP, it can’t solve the issue in this case.