Ignore exception, if request was aborted

src/Wemogy.AspNet.Tests/Middlewares/ErrorHandlerMiddlewareTests.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Net;
+using System.Threading;
 using System.Threading.Tasks;
 using FluentAssertions;
 using FluentValidation;
@@ -84,4 +85,33 @@ await middleware.InvokeAsync(
         // Assert
         context.Response.StatusCode.Should().Be((int)HttpStatusCode.BadRequest);
     }
+
+    [Fact]
+    public async Task CanceledRequestShouldBeIgnored()
+    {
+        // Arrange
+        var abortedCts = new CancellationTokenSource();
+        var context = new DefaultHttpContext
+        {
+            RequestServices = new ServiceCollection()
+                .AddLogging()
+                .BuildServiceProvider(),
+            RequestAborted = abortedCts.Token
+        };
+        var next = new RequestDelegate(
+            c =>
+            {
+                // simulate that somewhere in the pipeline we are checking for cancellation
+                c.RequestAborted.ThrowIfCancellationRequested();
+                return Task.CompletedTask;
+            });
+        var middleware = new ErrorHandlerMiddleware(next);
+
+        // Act
+        abortedCts.Cancel(); // simulate that the request was aborted
+        var exception = await Record.ExceptionAsync(() => middleware.InvokeAsync(context));
+
+        // Assert
+        exception.Should().BeNull();
+    }
 }

src/Wemogy.AspNet/Middlewares/ErrorHandlerMiddleware.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Net;
 using System.Threading.Tasks;
 using FluentValidation;
@@ -66,6 +67,17 @@ public async Task InvokeAsync(HttpContext context)
                 response.StatusCode = (int)HttpStatusCode.BadRequest;
                 await response.WriteAsJsonAsync(exception.Errors);
             }
+
+            // Catch OperationCanceledException, when the request is aborted
+            catch (OperationCanceledException)
+            {
+                if (context.RequestAborted.IsCancellationRequested)
+                {
+                    return;
+                }
+
+                throw;
+            }
         }
     }
 }