gopher

User types gopher://lingenic.com/design/ in the address bar. The extension intercepts, rewrites to HTTPS, adds the Accept header, fetches, and renders the gopher menu. The user sees gopher. The transport is HTTPS.

Gopher is a 1991 format for hierarchical text menus. Tab-separated fields. Type indicators. Selectors as paths. No markup. No styling. Just structured text.