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HTTP/2.

also: HTTP2 · HTTP/2 multiplexing

The HTTP version that multiplexes many request streams over one TCP connection and compresses headers (HPACK).

the two-minute refresher

Multiplexing: interleaved streams on one connection, no HTTP-level head-of-line blocking.
HPACK header compression shrank request headers by about 76% on average in Cloudflare's measurements.
Still on TCP, so one lost packet stalls every stream: HTTP/3 fixes that.
gRPC is built on HTTP/2 streams.

Where the course teaches it

W00 · Part 4Networking Fundamentals for System Designlearn it →

Related concepts

Head-of-line blocking
QUIC
gRPC