HTTP over QUIC (Quick UDP Internet Connection) is a new protocol that combines the HTTP/3 application layer protocol with the QUIC transport layer protocol. It is being developed by the Internet Engineering Task Force (IETF) to improve web performance, security, and reliability.

QUIC is a transport layer protocol that provides a number of advantages over TCP, the protocol traditionally used for HTTP. Unlike TCP, which requires a three-way handshake to establish a connection, QUIC uses a single handshake to establish both encryption and connection. This reduces the connection setup time, which can improve performance.