Earlier quoted context omitted.
Anyone between you and the server can change the content of the page on unencrypted connections. I would love to live in a world where encryption is unnecessary, but unfortunately that world does not exist right now.
You could do signatures/MAC without encryption to guarantee that the message was not modified
You do realise that “is it technically possible?” Is like 1% of the question in computing, at most, yes? HTTP and HTTPS are what we’ve got.