[tech] the duplo protocol

[Petite Abeille]

> On Dec 20, 2020, at 09:19, ew.gemini <ew.gemini at nassur.net> wrote:
> 
> Would you (or anyone else or several?) be able to /start/ writing
> it down in a form that would make Daniel Stenberg smile?

Actually, this has prompted Daniel to somewhat formalize what to expect from new protocols wishing to be included in curl:

https://curl.se/mail/lib-2020-11/0088.html
https://github.com/curl/curl/pull/6263