RFC 9460: DNS Service Binding Records (SVCB and HTTPS Resource Records) Specification
By
codewiz
An everything bagel for the brain. Substantive, layered, well-seasoned.
Summary
RFC 9460 specifies two new DNS resource record types - SVCB (Service Binding) and HTTPS - that enable more efficient service discovery and connection establishment. These records allow services to be provided from multiple endpoints with associated configuration parameters, support apex domain aliasing (which CNAME cannot do), and provide performance and privacy benefits by giving clients necessary information before connection attempts. The HTTPS RR is specifically designed for HTTP services as defined in RFC 9110.
Key quotes
· 4 pulledThis document specifies the "SVCB" ("Service Binding") and "HTTPS" DNS resource record (RR) types to facilitate the lookup of information needed to make connections to network services
SVCB records allow a service to be provided from multiple alternative endpoints, each with associated parameters (such as transport protocol configuration)
They also enable aliasing of apex domains, which is not possible with CNAME
By providing more information to the client before it attempts to establish a connection, these records offer potential benefits to both performance and privacy
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