x/net/http2: the first write error on a connection will cause all subsequent write requests to fail blindly [1.14 backport] #42112
Description
@bradfitz requested issue #39337 to be considered for backport to the next 1.14 minor release.
@gopherbot, please backport. I think this is pretty bad. (It bit us and there's no great workaround, short of disabling HTTP/2)