FileHandler: added catch OperationCanceledException

Author: alexeybannov

products/ASC.Files/Core/HttpHandlers/FileHandler.ashx.cs

@@ -1494,11 +1494,14 @@ private async ValueTask TrackFileAsync<T>(HttpContext context, T fileId)
             throw new HttpException((int)HttpStatusCode.Forbidden, FilesCommonResource.ErrorMessage_SecurityException);
         }
         TrackerData fileData;
+        
+        var requestAborted = context.RequestAborted;
+
         try
         {
             var receiveStream = context.Request.Body;
             using var readStream = new StreamReader(receiveStream);
-            var body = await readStream.ReadToEndAsync(context.RequestAborted);
+            var body = await readStream.ReadToEndAsync(requestAborted);
 
             logger.DebugDocServiceTrackBody(body);
             if (string.IsNullOrEmpty(body))
@@ -1513,6 +1516,11 @@ private async ValueTask TrackFileAsync<T>(HttpContext context, T fileId)
             };
             fileData = JsonSerializer.Deserialize<TrackerData>(body, options);
         }
+        catch (OperationCanceledException e) 
+        {
+            logger.ErrorDocServiceTrackReadBody(e);
+            throw new HttpException(StatusCodes.Status499ClientClosedRequest, "Client closed the connection prematurely");
+        }
         catch (JsonException e)
         {
             logger.ErrorDocServiceTrackReadBody(e);