Facebook announced on October 21 that they are replacing the de facto protocol the internet has used for decades with QUIC. Today, more than 75% of Facebook’s Internet traffic uses QUIC and HTTP/3. Facebook refers to the two collectively as QUIC and believes that QUIC has significant improvements over the old protocol in many aspects, including request errors, tail delays, and response header size.
QUIC (Quick UDP Internet Connections) is a project launched by Google, which aims to reduce the web delay based on TCP communication and replace the transmission control protocol TCP in a broad sense. QUIC is very similar to TCP+TLS+SPDY but based on UDP. It is the basic protocol of HTTP/3. A few days ago, Chromium officially announced that Chrome is deploying to HTTP/3 and IETF QUIC.
Facebook said that their first goal of using QUIC on the Internet was the Facebook application, and they also experimented with this. The experiment enabled QUIC for dynamic GraphQL requests in the Facebook application, which contained no static content.