Intent to Prototype: HTTP/3 protocol upgrade for HTTPS DNS records with h3 alpn parameter
Tsuyoshi Horo
Contact emails
Explainer
None
Specification
https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-svcb-https
Summary
HTTPS DNS resource records can provide information about supported protocols such as HTTP/3 with "alpn" parameter. If Chrome receives a HTTPS DNS record indicating HTTP/3 support, Chrome will connect to the server using the HTTP/3 protocol.
Blink component
Motivation
Currently Chrome can use the HTTP/3 protocol only after receiving an Alt-Svc header from the server using a non-HTTP/3 protocol. With this new feature, Chrome can connect to the server using HTTP/3 protocol without receiving the Alt-Svc header. This can reduce 1 RTT of handshaking of TCP which is required for non-HTTP/3 protocol while connecting to the server.
Initial public proposal
https://github.com/MikeBishop/dns-alt-svc
TAG review
Not applicable. No direct changes to web platform APIs. Change is to the underlying DNS infrastructure.
TAG review status
Not applicable
Risks
Interoperability and Compatibility
Gecko: Shipped/Shipping (https://www.mozilla.org/en-US/firefox/92.0/releasenotes)
WebKit: In development (https://mailarchive.ietf.org/arch/msg/dnsop/eeP4H9fli712JPWnEMvDg1sLEfg) Implemented behind "HTTP/3" Experimental Features
Web developers: Strongly positive (https://blog.cloudflare.com/speeding-up-https-and-http-3-negotiation-with-dns)
Other signals:
WebView application risks
Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?
No.
Debuggability
This feature will be debuggable using chrome://net-export/ and https://netlog-viewer.appspot.com/.
Is this feature fully tested by web-platform-tests?
No. We need an HTTP/3 server and a DNS server to test the feature, and we have neither in WPT.
Flag name
TBD
Requires code in //chrome?
False
Tracking bug
Estimated milestones
No milestones specified
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5154357283651584
This intent message was generated by Chrome Platform Status.
Yoav Weiss
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