Before we can use our SignalR real-time API, we need to enable SignalR and define the path for the endpoint. Let's carry out the following steps in Startup.cs:

1. We'll start by referencing our SignalR hub with the following using statement:

using QandA.Hubs;

2. Add SignalR to our ASP.NET app by using the AddSignalR method in the services parameter in the ConfigureServices method:

public void ConfigureServices(IServiceCollection services)
{
  ... 

  services.AddSignalR();
}

3. The next step is to configure the request pipeline so that we can pass SignalR requests to our SignalR hub:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
  ... 
  app.UseEndpoints(endpoints =>
  {
    endpoints.MapControllers();
    endpoints.MapHub<QuestionsHub>("/questionshub");
  });
}

So, SignalR requests to the /questionshub path will be handled by our QuestionHub class.

That's it—nice and simple! We are ready to interact with our SignalR real-time API from our frontend React app, which we'll do in the next section.