Hello Volunteers,
Currently I am not aware of any standard Servlet API to allow apps to
discover the following
* What protocol version is in use for the current request?
* How did we get to that protocol version? Straight to h2?  Or upgraded
  via 101 Switching Protocols?
* What transport is being used? h2c or h2?  Is ServletRequest.isSecure()
  enough?
I think it might be useful to allow apps to answer these questions.
Thoughts?
Ed
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