A new transport.
WHAT QUIC IS
A transport protocol built on datagrams, providing reliability, ordering and encryption itself.
WHY NOT BUILD ON THE EXISTING TRANSPORT
Changing it is impractical, because intermediate equipment interferes with anything unfamiliar.
WHAT IT PROVIDES
Streams that are independent, so loss on one does not stall others Encryption built in, not layered on Faster connection establishment Connection migration across network changes
WHAT CONNECTION MIGRATION MEANS
A connection surviving a change of address, such as moving from wireless to mobile.
WHY THAT MATTERS
Ordinarily that breaks every connection.
WHAT FASTER ESTABLISHMENT MEANS
Fewer round trips before data flows, and sometimes none for a resumed connection.
WHY THAT MATTERS MOST
On high-latency connections, round trips dominate.
WHAT HTTP/3 IS
HTTP carried over QUIC.
WHAT TO BE AWARE OF
Some networks block or degrade the datagram traffic it uses.
WHAT CLIENTS DO ABOUT THAT
Fall back to the previous version.
WHAT TO ENSURE
That fallback works, since it will be used.
