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Inside Firefox’s DOH engine

Filed under
Moz/FF

DNS over HTTPS (DOH) is a feature where a client shortcuts the standard native resolver and instead asks a dedicated DOH server to resolve names.

Compared to regular unprotected DNS lookups done over UDP or TCP, DOH increases privacy, security and sometimes even performance. It also makes it easy to use a name server of your choice for a particular application instead of the one configured globally (often by someone else) for your entire system.

DNS over HTTPS is quite simply the same regular DNS packets (RFC 1035 style) normally sent in clear-text over UDP or TCP but instead sent with HTTPS requests. Your typical DNS server provider (like your ISP) might not support this yet.

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