[http2] Gracefully receive headers on canceled streams #1800
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If a client opens a stream and then cancels it, the server may have already sent response frames back. The HTTP/2 spec says that the client MUST be prepared to receive any such frames. We already handle this correctly for data frames, but prior to this patch, header frames on a canceled stream would cause the whole connection to be torn down. This patch fixes that.
Fixes #1799.
Test Plan:
Unit tests included. Before this change, the new test would fail with "Connection is being forcefully terminated. (errorCode: 1)".
wchargin-branch: http2-headers-after-cancel