What is QUIC protocol, and how to use through Rust?

Progressing through HTTP/1 and HTTP/2, HTTP/3 is now widely expanding in the data transmission domain. About 30% of websites worldwide have adopted HTTP/3, and QUIC, the underlying protocol for HTTP/3, is used by 8.0% to 8.2% of all websites globally. It has been first developed by Google, and now standardized by IETF.

So, what is QUIC?

"QUIC = Quick UDP Internet Connection", is one kind of transport layer network protocol. As you can expect on its naming, it is built on top of UDP.

0-RTT dramatically speeds up resumed connections, and this establishment leads to a smoother web experience for frequently visited sites.

Avoid head-of-line blocking

Head-of-line(HoL) blocking is one kind of performance issue which occurs during network communication.

In TCP, data is transmitted in stream, and packets must be received + acknowledged in order they were send. If any packet is missing, packets behind this must wait until missing one has been re-transmitted and received. It means all data inside stream is being stopped based on this rule.