dotnet-core/release-notes/3.0/api-diff/Asp.Net/3.0.0_Microsoft.AspNetCore.SignalR.md

Microsoft.AspNetCore.SignalR

 {
     namespace Microsoft.AspNetCore.Builder {
+        public sealed class HubEndpointConventionBuilder : IEndpointConventionBuilder, IHubEndpointConventionBuilder {
+            public void Add(Action<EndpointBuilder> convention);
+        }
+        public static class HubEndpointRouteBuilderExtensions {
+            public static HubEndpointConventionBuilder MapHub<THub>(this IEndpointRouteBuilder endpoints, string pattern) where THub : Hub;
+            public static HubEndpointConventionBuilder MapHub<THub>(this IEndpointRouteBuilder endpoints, string pattern, Action<HttpConnectionDispatcherOptions> configureOptions) where THub : Hub;
+        }
+        public interface IHubEndpointConventionBuilder : IEndpointConventionBuilder
     }
 }