HTTPSSVC is a new DNS resource record that contains an extensible key-value map. With HTTPSSVC, clients can obtain pre-connection information efficiently, with just one additional DNS query.


HTTPSSVC is a new DNS resource record, proposed in draft-ietf-dnsop-svcb-httpssvc. Essentially, it is a serialized key-value map containing information that a client needs in order to efficiently establish an HTTPS connection. Use of HTTPSSVC will improve Chromium’s privacy and performance when establishing connections.



Specification link

Specification being incubated in a Community Group

Status in Chromium


No active development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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Intent to Prototype url

Intent to Prototype thread


Search tags

httpssvc, dns,

Last updated on 2021-09-24