HTTP/1 vs HTTP/2 vs HTTP/3: 23 concepts every engineer should know
HTTP/1.1’s single in-order queue explains keep-alive, six connections per host and domain sharding. HTTP/2’s multiplexed binary frames remove that queue, but one lost TCP packet still stalls every stream — which is why HTTP/3 moved to QUIC over UDP.
Summarized from 11 HTTP Concepts Explained for Beginners by Neo Kim
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