[SignalR] Pass cancellation token to FlushAsync #41180
Merged
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Fixes #40475
The token wasn't being passed in because of a bug in Pipelines see original change aspnet/SignalR#1718 (comment)
The bug was fixed a day after the PR was merged and we never reacted 🤣
dotnet/runtime#25633
For full transparency, this doesn't mean the written Hub message wont be sent to the server. It only means the user has decided they don't want to wait any longer on any backpressure applied by the Pipe. For invokes it also means the client will ignore any CompletionMessage for the canceled invokes (but this isn't new).