Discover and read the best of Twitter Threads about #http3

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Today, after over 5 years of work, HTTP/3 was finally standardized as RFC 9114! rfc-editor.org/rfc/rfc9114.ht…

Together with RFC 9204 (QPACK header compression) and RFC 9218 (Extensible Priorities) it ushers in an important new chapter for the Web!

Proud to have been part of this! HTTP/3 logo
HTTP/2 was also updated as the new RFC 9113 rfc-editor.org/rfc/rfc9113.ht… mainly to remove the old prioritization system.

Even HTTP/1.1 and general HTTP semantics + caching concepts were tightened up in RFCs 9110-9112.

Big day for the arguably most used application layer protocol 😃 Diagram comparing http 1, 2...
In case you want to know more about why #HTTP3 is needed and how it works, I have an in-depth article series @smashingmag : smashingmagazine.com/2021/08/http3-…
Read 3 tweets
Data and thoughts after enabling HTTP/3 at @Wix for our user domains #webperf #http3 #quic

Positive impact from TTFB to later phases such as FCP and LCP

1. TTFB p75 for CDN hits is considerably faster (~2x), especially in countries with weak devices or connections Image
2. Browser Adoption - Chrome/Firefox currently support the latest h3, Edge/Opera support h3-29

60% - 70% of requests are using HTTP/3 in Chromium based browsers (Chrome, Edge, Opera), and 40% of Firefox requests
Only 2% of Safari (experimental, will it be the default in iOS 15?)
3. Session breakdown per protocol and browser for first page views tells a bit of a different story.
Only ~15%-20% of HTML requests are using HTTP/3

This can probably be explained by the connection upgrade behavior of the alt-svc header - first time visitors initially use h2 Image
Read 8 tweets

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