QUIC
QUIC is a secure transport protocol over UDP with its own reliable streams. HTTP/3 uses QUIC; the terms refer to different protocol layers.
What is QUIC?
QUIC is a transport protocol whose packets are carried in UDP datagrams. It adds its own mechanisms for connections, ordered streams and reliable delivery. RFC9000 describes these properties and the integration of the TLS handshake. Reliability therefore does not come from UDP alone.
Example: planning a web service connection
In a fictional design, a web service uses HTTP/3 and therefore QUIC for transport. The publicly reachable endpoint must support the connection, and the required UDP communication must pass through the network.
QUIC and HTTP/3 are different protocol layers. Support for the transport says nothing about whether a particular application function has been implemented correctly or who may call it.
When problems occur, the team therefore distinguishes connection establishment, data transfer and the application outcome. The name QUIC does not guarantee an improvement to every loading time. That requires comparisons under actual network and usage conditions.
Sources
Related terms
- User Datagram ProtocolUDP transfers individual datagrams without its own guarantee of delivery or order. A protocol built on top must provide any required reliability.
- HTTP/3HTTP/3 carries HTTP over QUIC. Benefits and reachability also depend on the network and endpoints; a universal speed improvement is not established.
- Transport Layer SecurityTLS protects data in transit between its endpoints. Application permissions, stored data and further connections need their own measures.
- Return-PathReturn-Path records the SMTP reverse path in a header. It explains the technical route for error reports, not a person’s identity.
- Envelope-FromEnvelope-From identifies the SMTP sender for transport and error feedback. It must be distinguished from the visible sender address.
- DMARC aggregate reportA DMARC aggregate report summarises a reporting mail system’s domain checks over a period. It helps examine sending sources and misconfigurations.
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