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Why does it show that DNS-over-HTTPS is app layer?

Isn't HTTPS HTTP-over-TLS? (transport layer)

Therefore DNS-over-HTTPS is (DNS-over-HTTP)-over-TLS? (transport layer)

HTTP and DNS are all app layer. In fact, so is TLS but is sometimes said to belong to a session layer between the app and transport layer (there is no session layer in the internet protocols suite, this is an OSI layer: TLS is session layer in OSI, application layer in TCP/IP).

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