Gemini's native protocol isn't HTTP, they invented their own. I don't really see what this does you couldn't do with simple HTML pages (or Gopher 35 years ago).

... which looks even more stupid when you can force quite a number of browsers to get you something through gopher if you just pretend it's http on port 70. of course you have to self interpret the result, but gophermaps are quite readable. :)