October 31, 2019 to November 1, 2019 AGM
JW Marriott Austin
America/Winnipeg timezone
OARC31 Presentation Videos available at https://youtube.com/DNS-OARC

DoH Preference Hints for HTTP

Oct 31, 2019, 2:30 PM
Griffin Hall (JW Marriott Austin)

Griffin Hall

JW Marriott Austin

110 E 2nd St Austin TX 78701 USA
No longer available: Standard Presentation Public Workshop


Jesse Kipp (Cloudflare) Nick Sullivan


When using a publicly available DNS-over-HTTPS (DoH) server, some
clients may suffer poor performance when the authoritative DNS server
is located far from the DoH server. For example, a publicly
available DoH server provided by a Content Delivery Network (CDN)
should be able to resolve names hosted by that CDN with good
performance but might take longer to resolve names provided by other
CDNs, or might provide suboptimal results if that CDN is using DNS-
based load balancing and returns different address records depending
or where the DNS query originated from.

In this talk, we will propose a new HTTP header intended to
lessen these issues by allowing the web server to indicate to the
client which DoH server can best resolve its addresses. This proposal
defines an HTTP header field that enables web host operators
to inform user agents of the preferred DoH servers to use for
subsequent DNS lookups for the host's domain. This presentation is
based on an IETF Internet-Draft presented at IETF 105.

Talk Duration Lightning Talk 5 Minutes

Primary authors

Jesse Kipp (Cloudflare) David Schinazi (Google) Nick Sullivan

Presentation materials