# Microsoft.AspNetCore.Http.Features

``` diff
 namespace Microsoft.AspNetCore.Http.Features {
     public class FeatureCollection : IEnumerable, IEnumerable<KeyValuePair<Type, object>>, IFeatureCollection {
+        public FeatureCollection(int initialCapacity);
     }
+    public interface IBadRequestExceptionFeature {
+        Exception Error { get; }
+    }
+    public interface IHttpActivityFeature {
+        Activity Activity { get; set; }
+    }
-    public interface IHttpBufferingFeature {
 {
-        void DisableRequestBuffering();

-        void DisableResponseBuffering();

-    }
-    public interface IHttpSendFileFeature {
 {
-        Task SendFileAsync(string path, long offset, long? count, CancellationToken cancellation);

-    }
 }
```

