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Why HTTP Uses TCP Over UDP, and How HTTP/3 Changes the Equation

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HTTP has traditionally relied on TCP because the protocol guarantees reliable, ordered delivery of data packets across the internet. Without TCP, issues like lost packets, duplicated data, or out-of-order delivery would require HTTP itself to handle retransmission and reassembly. Plain UDP offers no such guarantees, meaning a missing packet would go undetected and unrecovered at the transport layer. HTTP/3, however, breaks from this pattern by running over UDP — but it does so through QUIC, a protocol that rebuilds TCP-like reliability, ordering, and congestion control on top of UDP. This approach retains UDP's performance advantages while preserving the dependability that web communication requires.

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Why HTTP Uses TCP Over UDP, and How HTTP/3 Changes the Equation · ShortSingh