HTTP/3 and QUIC: Why the Web is Moving to UDP

If you inspect traffic on YouTube or Facebook today, you won't see TCP. You will see UDP port 443. This is HTTP/3.

1. Head-of-Line Blocking (TCP's Flaw)

In HTTP/2 (TCP), if one packet gets lost, everything stops waiting for retransmission.

2. QUIC (UDP) Solves This

QUIC treats every stream independently. If Packet A is lost, Packet B is still delivered to the browser.

Check if your browser supports QUIC using our Connection Protocol check in the API.