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SignalR–Automatic reconnect

With the release of .NET Core 3.0, Microsoft updated SignalR as well. One of the new features is the re-introduction of Automatic Reconnect. Automatic reconnect was part of the original SignalR for ASP.NET, but wasn’t available (until recently) in ASP.NET Core.
The JavaScript client for SignalR can be configured to automatically reconnect using the withAutomaticReconnect method on HubConnectionBuilder. It won't automatically reconnect by default.

Without any parameters, withAutomaticReconnect() configures the client to wait 0, 2, 10, and 30 seconds respectively before trying each reconnect attempt, stopping after four failed attempts.
You can configure the number of reconnect attempts before disconnecting and change the reconnect timing, by passing an array of numbers representing the delay in milliseconds to wait before starting each reconnect attempt:

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