http2/h2c: propagate HTTP/1 server configuration to HTTP/2

[WeidiDeng]

Fixes golang/go#37089

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Message from Damien Neil:

Patch Set 1:

(3 comments)

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This PR (HEAD: 805b90e) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/net/+/419181 to see it.

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Message from Weidi Deng:

Patch Set 3:

(3 comments)

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Message from Damien Neil:

Patch Set 3: Run-TryBot+1 Code-Review+2

(1 comment)

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Message from Gopher Robot:

Patch Set 3:

(1 comment)

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Message from Gopher Robot:

Patch Set 3: TryBot-Result+1

(1 comment)

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Message from Michael Knyszek:

Patch Set 3: Code-Review+1

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This PR is being closed because golang.org/cl/419181 has been merged.