#102 Filter out DEBUG requests under the debugger.

src/Microsoft.AspNetCore.Server.IISIntegration/IISMiddleware.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Diagnostics;
 using System.Globalization;
 using System.Security.Principal;
 using System.Threading.Tasks;
@@ -61,6 +62,13 @@ namespace Microsoft.AspNetCore.Server.IISIntegration
                 return;
             }
 
+            if (Debugger.IsAttached && string.Equals("DEBUG", httpContext.Request.Method, StringComparison.OrdinalIgnoreCase))
+            {
+                // The Visual Studio debugger tooling sends a DEBUG request to make IIS & AspNetCoreModule launch the process
+                // so the debugger can attach. Filter out this request from the app.
+                return;
+            }
+
             if (_options.ForwardClientCertificate)
             {
                 var header = httpContext.Request.Headers[MSAspNetCoreClientCert];