HTTP/3 and QUIC Explained: What API Developers Need to Know

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HTTP/3 is the latest version of the HTTP protocol, built to run on QUIC — a transport protocol standardized in RFC 9000 that operates over UDP instead of TCP. Unlike TCP, QUIC integrates TLS 1.3 encryption from the first packet and combines connection and security handshakes into a single round trip, reducing latency. A key advantage of QUIC is its independent stream multiplexing, which means a lost packet blocks only the affected stream rather than freezing all concurrent requests — a flaw known as head-of-line blocking in HTTP/2 over TCP. QUIC also uses connection IDs instead of IP-port pairs, allowing devices to seamlessly switch between Wi-Fi and mobile networks without dropping and re-establishing connections. Importantly, core API semantics — including methods, status codes, headers, and JSON payloads — remain unchanged across HTTP versions, so existing API tools continue to work regardless of the underlying transport.

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