I am using the HTTP template to connect to an in-house system that is only handling HTTP/2 requests. Getting HTTP Status 464 which has to do with protocol incompatibility per https://http.dev/464.
It seems that the HTTP Template only supports HTTP/1.1.
Is that the case?
Is there a way to force usage of HTTP/2
Welcome to the Make community!
That’s a great idea! I’m sure others would agree that this is a nice feature to have.
You can submit this suggestion to the Idea exchange, under App improvement ideas
Don’t forget to search for it first, just in case someone already suggested it, so that you don’t end up creating a duplicate.

Hope this helps! Let me know if there are any further questions or issues.
— @samliew
P.S.: Investing some effort into the Make Academy will save you lots of time and frustration using Make.