The HTTP-protocol is (also) a de facto layer-4 transport-layer-protocol.

It might have been intended to be a layer-7 application-layer-protocol, but — look at how people are using it.

Applications are built on top of the HTTP-protocol somewhat similarly to how people decades ago would have built applications on top of the TCP-protocol.

Even the Fediverse uses the HTTP-protocol in this way — as a layer-4 transport-layer-protocol.

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