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@Jain@blob.cat wdym? I mean what I imagine the how of it being implemented is that both the client and server will have to use a new header to negotiate the capability for 3xx push (or "pipelined 3xx").. Kinda like this:
GET /resource HTTP/1.1 Host: example.com Pipelined-3xx: HTTP/1.1 302 Found Pipelined-3xx: 1 Server: example Location: /actual-resource HTTP/1.1 200 OK Server: example Content-Type: text/html Content-Length: 792