HTTP/3 QUIC
ELI5 — The Vibe Check
HTTP/3 ditches TCP for QUIC, a protocol built on UDP that handles congestion, encryption, and multiplexing all at once. No more head-of-line blocking. No more slow TLS handshakes. It's HTTP for the fast lane.
Real Talk
The third major version of HTTP, using QUIC (Quick UDP Internet Connections) as its transport layer instead of TCP. QUIC provides built-in TLS 1.3 encryption, eliminates head-of-line blocking at the transport layer, supports connection migration (switching networks without reconnecting), and reduces connection setup to 0-1 RTT.
When You'll Hear This
"HTTP/3 over QUIC eliminates head-of-line blocking that plagued HTTP/2 over TCP." / "QUIC's connection migration means your video call doesn't drop when you switch from WiFi to cellular."
Related Terms
HTTP/2
HTTP/2 is a supercharged version of HTTP. With HTTP/1.1, you could only ask for one thing at a time per connection.
TCP (Transmission Control Protocol)
TCP is like sending a package with delivery confirmation.
TLS (TLS)
TLS (Transport Layer Security) is the updated, actually-secure version of SSL. It's the technology that puts the padlock in your browser's address bar.
UDP (User Datagram Protocol)
UDP is like shouting information across a room — fast but no guarantee anyone heard you. There's no handshake, no confirmation.