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Jun 6 • 3 tweets • 2 min read
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-…

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More from @programmingart

Robin Marx Profile picture
Jun 13
Apple's @vidhigoel07 had a great session at #WWDC last week, talking about improving network latency through:

🔛implementation tuning (for example buffer sizing)
🔜network assistance (like L4S, the new Low-Latency, Low-Loss proposal!).

developer.apple.com/videos/play/ww…

Some thoughts👇 Image
A big part of observed network latencies/delays is due to so-called bufferbloat:

Too large intermediate buffers, both on the endpoints and in the network, cause packets to stay in the buffer too long, delaying them. Image
On the endpoints, this can be improved by tuning buffer sizes for different protocols (TCP/QUIC, TLS and HTTP have their own buffers!). Default sizes are often too high.

Other good sources:
- blog.cloudflare.com/http-2-priorit…
- slideshare.net/kazuho/program… (the first I ever saw from @kazuho!) Image
Read 9 tweets
Robin Marx Profile picture
Jun 8, 2021
Day 4 of our deep dive into the freshly standardized #QUIC protocol is about one of its most innovative aspects: connection migration!

This is intended to allow #QUIC connections to survive network changes that are disruptive in TCP.

1/12 #RFC9000
Take the "parking lot problem": you have WiFi on your phone inside, but switch to 4G when going to your car.
This switches networks and client IP/port, so all TCP connections are dropped and re-started, since they're only identified based on client+server IP+port (4-tuple). 2/12
QUIC instead assigns each connection a unique Connection ID (CID) of 1-20 bytes.

By using the same CID even after switching networks, the server knows it's actually the same connection, even though the 4-tuple has changed. 3/12
Read 12 tweets
Robin Marx Profile picture
Dec 5, 2018
I wrote a blog post looking at potential threats for #QUIC and HTTP/3 adoption and deployment calendar.perfplanet.com/2018/quic-and-…. This will also be the basis for a talk at the HTTP symposium at curl-up in Prague at the end of March 2019 github.com/curl/curl-up/w…
Yesterday, there was a #QUIC workshop at the #conext18 conference with a large amount of new insights. Most of my notes on this can be found at docs.google.com/document/d/16S…. Following tweets contain the parts relevant to the blogpost.
For example, Intel was here with a demo of a NIC that can offload #QUIC crypto to hardware. When asked later, Manasi Deval mentioned that specifically Variable Integer Encoding (to reduce the amount of bits on the wire) is a serious hindrance for #QUIC hardware support.
Read 9 tweets

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