What is the difference between HTTP/2 and HTTP/3?

HTTP/2 introduced multiplexing, which handles multiple requests over a single TCP connection, noticeably improving load time compared to HTTP/1.1. HTTP/3 builds on the QUIC protocol and replaces TCP with UDP, resulting in faster connection establishment and preventing packet loss from blocking individual streams. In practice, users with unstable mobile connections benefit most from HTTP/3. We ensure your server supports both protocols so visitors automatically use the fastest available variant.