Cloudflare, Google Chrome, and Firefox add HTTP/3 support | ZDNet

By default, classic HTTP (a layer 7 protocol) uses TCP (a layer 4 protocol) as it’s base.

To solve speed issues with TCP and encryption with it, Google created SPDY, a protocol that fixed some of TCP’s problems. HTTP-over-SPDY protocol eventually became the official HTTP/2, which is now used on around 40% of all internet sites.

Later Google engineers realized they could do much better if make a totally new protocol. That’s how QUIC came to be, or “Quick UDP Internet Connections.”

HTTP/3 is QUIC implemented inside HTTP, replacing TCP and SPDY at the transport level. It was formally approved last October. HTTP/3 is currently used by only 3% of all internet websites.


  1. Tomi Engdahl says:

    DOS implications: “Both Google and Facebook have mentioned that their wide scale deployments of QUIC require roughly twice the amount of CPU than the same traffic load does when serving HTTP/2 over TLS.”

  2. Tomi Engdahl says:

    HTTP/3 (the third major version of the Hypertext Transfer Protocol used to exchange binary information on the World Wide Web, succeeding HTTP/2.) has enabled it and is now waiting for mainstream browsers like FF, Chrome, and others to start sending traffic over http/3.

  3. Tomi Engdahl says:

    There is rather low HTTP/2 deployment at the moment, should we skip HTTP/2? :)

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