http2: return PROTOCOL_ERROR when http2 reads an http1.1 response

[jingyugao]

When destinate is "http/1.1 " server, client should return "PROTOCOL_ERROR".
Before this pr,client will return an frame will bad length. and then cause an "too large frame" error.
see golang/go#35724

[gopherbot]

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[gopherbot]

Message from Brad Fitzpatrick:

Patch Set 1:

This is missing background information about when this would happen & why we'd want this.

It's also missing tests, but you can wait on those until we understand what this change is about.

Also, see https://github.com/golang/go/wiki/CommitMessage

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[gopherbot]

Message from Jingyu Gao:

Patch Set 2:

https://tools.ietf.org/html/rfc7540#section-6.5
according to the rfc, we should return a PROTOCOL_ERROR when receive a badly frame.
But now, we just treat it is a normal frame and after parse it, we get an FRAME_SIZE_ERROR.
I think we should distinguish the error.

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[gopherbot]

Message from Jingyu Gao:

Patch Set 2:

Maybe we can check the first frame that client receved is euqal []byte{0 0 6 4 0 0 0 0 0 0 5 0 0 64 0} ?

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[gopherbot]

Message from Brad Fitzpatrick:

Patch Set 3:

Please file a bug on GitHub first and tell us how you got into this situation.

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[gopherbot]

This PR (HEAD: 4634c64) has been imported to Gerrit for code review.

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[gopherbot]

Message from Jingyu Gao:

Patch Set 4:

I have add the test case in the pr.
PTAL.

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[gopherbot]

Message from Brad Fitzpatrick:

Patch Set 4:

Patch Set 4:

I have add the test case in the pr.
PTAL.

I won't be looking at the code until there's a bug with background info about the situation where this becomes necessary.

See my comments above.

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