DNS-over-HTTPS (DoH) is a security protocol that provides encryption and privacy for Domain Name System (DNS) queries and responses by sending them over HTTPS. HTTPS is the secure version of the HTTP protocol that is used to transmit web pages and other data over the internet.

DoH is similar to DNS-over-TLS (DoT) in that it encrypts DNS traffic, but instead of using a dedicated TLS connection for each DNS query, it sends DNS queries and responses over HTTPS. This allows DoH to use the existing infrastructure for web traffic, such as web browsers and web servers, to handle DNS requests and responses.

When a client uses DoH, it sends its DNS queries to a DNS resolver that supports DoH using an HTTPS request. The DNS resolver then responds with an HTTPS response that contains the encrypted DNS answer. The client can verify the authenticity of the resolver's TLS certificate to ensure that it is communicating with the correct resolver.

DoH provides a way to protect DNS traffic from interception and manipulation by attackers, and it can also help to bypass DNS filtering and censorship. It is supported by many DNS resolvers and web browsers, and it can be used to enhance the privacy and security of DNS queries on any device or network that supports it.

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