Add using

Author: divyeshio

src/Http/Routing/src/Builder/RoutingEndpointConventionBuilderExtensions.cs

@@ -4,6 +4,7 @@
 using Microsoft.AspNetCore.Http.Metadata;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.AspNetCore.WebUtilities;
+using Microsoft.AspNetCore.Http;
 
 namespace Microsoft.AspNetCore.Builder;