Pipelines in ASP.NET Core 3.0

[analogrelay]

• Replace our default wrapping with the wrappers present in corefx
• Make the features read-only.

cc @davidfowl

[analogrelay]

@davidfowl to drive, but @jkotalik as backup because we all know how well we can trust David on the critical path ;P

[davidfowl]

I'm going to do this all in ASP.NET Core and nothing in corefx. Then we can react once we get the changes into corefx. That will allow us to make all of the changes to upstream components (just the form reader) and it'll let use flesh out the API.

[analogrelay]

Ok, updating description (above) to reflect recent discussion. Also moving to preview6 for remaining work.

[analogrelay]

We decided not to remove the BodyReader/BodyWriter properties...right?

[jkotalik]

Yeah... we still should try to start using the corefx adapters though.

[davidfowl]

Right. I’ll do the update to make the pipe properties readonly