HTTP/3 or H3 is the upcoming HTTP (Hypertext Transport Protocol) version that leverages QUIC.
QUIC (Quick UDP Internet Connections) – as you can guess by the abbreviation, is a UDP-based protocol built considering the next-generation internet. Ensuring the website or web application loads faster across every device from everywhere is challenging, and H3 aims to help with that.
Once you have enabled H3 on your site, you can quickly use the Geekflare H3 testing tool to determine its status. This tool is powered by cURL to connect using HTTP3 and shows the supported versions.
It’s still in the draft, so expect limited server and client support.
While HTTP/2 was a major successful upgrade over HTTP/1.1, you may ask what’s wrong to update it further?
With HTTP/2, a single packet loss in the TCP connection blocks the complete data stream (Head-of-line-blocking). That was indeed worse than what we had with HTTP/1.1.
Put simply, H3 will improve over this. So, a network interruption will be kept limited to that specific stream.
In addition, HTTP/3 comes with 0-RTT, zero roundtrip time. This means for reconnections, the client and servers can avoid TLS handshake decreasing the network latency.
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