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HTTP/3 is everywhere but nowhere

HTTP/3 has been in development since at least 2016, while QUIC (the protocol beneath it) was first introduced by Google way back in 2013. Both are now...

With QUIC, you can do 0RTT TLS handshakes opens in a new tab, meaning you can connect to a server and send an HTTP request immediately, without waiting for a single packet in response, so there's no unnecessary RTT delay whatsoever. The combination of hyperscale's evergreen clients plus money & motivation plus tight links between implementers and the business using the tools, means they can move fast to quickly build, ship & iterate new approaches. There's an argument that despite the benefits, the long-tail web doesn't need HTTP/3, so they can just ignore it, or use a CDN with built-in support if they really care, and there is no real obligation as such for the hyperscalers to provide convenient implementations to the rest of us just because they want to use some neat new tech between themselves.

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