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Problem
Sending a message to the socket may fail if the sink has shut down. Currently, this always causes clients to immediately close instead of trying to reconnect. We want the client to always have a chance to reconnect when disconnected or closed by the server.
Solution
Emit the socket sink error and update the client actor to ignore connection-related sink closure reasons. The server does not have a reconnect pattern, so we allow it to close a session if the session's socket sink shuts down.