ASP.NET Core 3 and React

Chapter 9 – Creating a Real-Time API with SignalR

1. In a SignalR hub class, what method can we use to push data to a group of connected clients?

We can use the following:

Clients.Group("GroupName").SendAsync()

2. In a SignalR hub class, what method can we use to push data to all clients except for the client that has made the request?

We can use the following:

Clients.AllExcept(Context.ConnectionId).SendAsync()

3. Why did we need a CORS policy for our React app to be able to interact with our SignalR real-time API?

A CORS policy is required because the frontend and backend were hosted in different domains.

4. In our React frontend, why did we check whether the connection was in a connected state before subscribing to the question?

If starting ...