net/http: access to written data after ResponseWriter.Write returns

[neild]

The HTTP/2 ResponseWriter can access the contents of the slice passed to Write after Write returns.

• When closing a stream while a write is in progress.
• When shutting down the server while a write is in progress.

This is a violation of the io.Writer contract, and responsible for a number of recent net/http flakes.

[gopherbot]

Change https://go.dev/cl/467055 mentions this issue: http2: wait for in-progress writes after a stream is closed

[gopherbot]

Change https://go.dev/cl/467355 mentions this issue: http2: avoid referencing ResponseWrite.Write parameter after returning

[gopherbot]

Change https://go.dev/cl/467657 mentions this issue: all: update vendored golang.org/x/net