Motivation:
DefaultHttp2FrameWriter has constructors that it would be a hassle to
expose as configuration parameters on Http2Codec. We should instead
make a builder for Http2Codec.
Modifications:
Get rid of the public constructors on Http2Codec and instead make sure
you can always use the builder where you would have used the constructor
before.
Result:
Http2Codec can be configured more flexibly, and the SensitivityDetector
can be configured.
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