Possible to support only HTTP/2 for "http" URIs? "https" URIs?

*Is it possible to support just HTTP/2 for "http" URIs?*

For example, consider the scenario where a server only wants to support clear-text HTTP version 2 (h2c) i.e. not allow/parse HTTP/1.x requests.



I believe it has the two following options, but please correct me if I am wrong.



a. "Upgrade"

If a HTTP/1.x request arrives _with_ an "Upgrade: h2c" header, do the following: Send "101 switching protocols".  Immediately send RST_STREAM/REFUSED_STREAM on stream 1 and _hope_ the client re-sends the request as an h2c request.



b. "Alt-Svc"

If a HTTP/1.x request arrives _without_ an "Upgrade: h2c" header, do the following: Send a "505 HTTP Version Not Supported" with an Alt-Svc header e.g. "Alt-Svc: h2c=82". It's up to the client to switch to h2c at the specified port.





*Is it possible to support just HTTP/2 for "https" URIs?*

I believe it's possible to support only HTTP version 2 (h2) by simply only negotiating for "h2" and rejecting all other requests.





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