In working on #4948 I noticed that Identity, Compress, and Chunked tests were missing. I was able to add Deflate as it was low hanging fruit.

Chunked "kind of" gets tested with gzip as Kestrel returns the gzip data chunked. But a separate test for just chunked without gzip would be better.

Compress might require a 3rd party API. Unless there is some LZW support hidden in .NET Core 2.0 that I missed.

Identity is low hanging fruit.