[Lukasa]

That's a totally understandable fear. Personally, I trust the ability of user-agents to help users make informed decisions in this area, but I can understand why you don't. Nevertheless, even with this proposal HTTP/2.0 will be substantially more secure than HTTP/1.1 is, at least in the aggregate.

It's also worth noting that this is a proposal. You didn't actually make this mistake yourself but I do want to highlight it: the HTTP WG is not yet discussing this as anything more than a suggestion (see http://lists.w3.org/Archives/Public/ietf-http-wg/2014JanMar/... ). If you are worried about this sort of proposal becoming a draft, I highly recommend you join the working group and keep an eye on the proxy discussions.