Not e-ink related per se, but possibly e-ink friendly:
Not sure how this would help. What we need for e-Ink is not a new (or in this case, old) protocol, we need a new web browser. HTTP has nothing to do with the browser UI, or even with how websites are presented. For a practical example, look how well the reading mode works in your browser. It looks nothing like the HTML/CSS says it should look like, but it’s very readable and, for the most part, e-paper friendly.