Replace Globalhost.Dependency resolver in the new Asp.net Core SignalR

I am migrating my current code which is in .NET framework 4.8 to new .NET Core 5.0. Following is my original Startup.cs.

    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            var container = new UnityContainer();
            var unityConfiguration = new UnityConfiguration();
            unityConfiguration.RegisterTypes(container);

            GlobalHost.DependencyResolver = new UnityDependencyResolver(container);

            GlobalHost.HubPipeline.AddModule(new SessionIdCheckModule());

            app.UseCors(new CorsOptions
            {
                PolicyProvider = new WildcardCorsPolicyProvider()
            });

            var listener = (HttpListener)app.Properties[typeof(HttpListener).FullName];
            listener.AuthenticationSchemes = AuthenticationSchemes.Ntlm | AuthenticationSchemes.Negotiate;

            //Throttling of http.sys to prevent too many requests being accepted at once.
            var maxAccepts = 25;
            var maxRequests = 25;
            var queueLimit = 25;
            var owinListener = (OwinHttpListener)app.Properties[typeof(OwinHttpListener).FullName];
            owinListener.SetRequestProcessingLimits(maxAccepts, maxRequests);
            owinListener.SetRequestQueueLimit(queueLimit);

            TurnOffWebSocket(GlobalHost.DependencyResolver);

            app.MapSignalR();
        }

        //Have to use Ajax long polling as the transport, to get around mixed content blocking in browsers.
        public void TurnOffWebSocket(IDependencyResolver resolver)
        {
            var transportManager = resolver.Resolve<ITransportManager>() as TransportManager;
            transportManager.Remove("webSockets");
            transportManager.Remove("serverSentEvents");
            transportManager.Remove("foreverFrame");
        }
    }}

Can anyone suggest on following.

1. What is the replacement of Globalhost.Dependency resolver?
2. I want to keep using Unity for DI and not in build DI of asp.net core. How can I achieve that ?
3. What can be used to achieve behaviour of HubPipelineModule?