Not a final solution,dealing with 403 status codes ...

src/Yavsc/Startup/YaSendFileMiddleware.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNet.Builder;
+using Microsoft.AspNet.Http;
+using Microsoft.AspNet.Http.Features;
+using Microsoft.Extensions.Logging;
+
+namespace Yavsc
+{
+    public class YaSendFileMiddleware
+    {
+
+
+        private readonly RequestDelegate _next;
+
+        private readonly ILogger _logger;
+
+        //
+        // Résumé :
+        //     Creates a new instance of the SendFileMiddleware.
+        //
+        // Paramètres :
+        //   next:
+        //     The next middleware in the pipeline.
+        //
+        //   loggerFactory:
+        //     An Microsoft.Extensions.Logging.ILoggerFactory instance used to create loggers.
+        public YaSendFileMiddleware(RequestDelegate next, ILoggerFactory loggerFactory)
+        {
+            if (next == null)
+            {
+                throw new ArgumentNullException("next");
+            }
+            if (loggerFactory == null)
+            {
+                throw new ArgumentNullException("loggerFactory");
+            }
+            _next = next;
+            _logger = loggerFactory.CreateLogger<YaSendFileMiddleware>();
+        }
+
+        public Task Invoke(HttpContext context)
+        {
+            if (context.Response.StatusCode < 400 || context.Response.StatusCode >= 600 )
+            {
+            if (context.Features.Get<IHttpSendFileFeature>() == null)
+            {
+                context.Features.Set((IHttpSendFileFeature)new YaSendFileWrapper(context.Response.Body, _logger));
+            }
+            }
+            return _next(context);
+        }
+    }
+}