ASP.NET Core SignalR chat with Angular 5 - https://codingblast.com/asp-net-core-signalr-chat-angular

Startup.cs

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseCors("CorsPolicy");

    app.UseSignalR(routes =>
    {
        routes.MapHub<ChatHub>("chat");
    });
}