HTTP/1.1 vs HTTP/2 vs HTTP/3 on Your Server
Three version numbers in one nginx config. What HTTP/2 multiplexing and HTTP/3 over QUIC actually change, how to enable each, and when it is worth it.
#http3
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What is HTTP? A server admin's guide
HTTP explained for people who run servers: methods, status codes, the headers that matter, what nginx logs, and where HTTP/3 and TLS fit in.