Hosting asp.net core web api inside Functions throwing error

Hi,

I tried to host aspnet core web api app inside azure functions. Followed the below article.
https://blog.wille-zone.de/post/serverless-webapi-hosting-aspnetcore-webapi-in-azure-functions/

**Web API as Azure Function Url**
https://aspnetcoreproxytest.azurewebsites.net/api/values/test

**Error**

InvalidOperationException: Application is running inside IIS process but is not configured to use IIS server.

Microsoft.AspNetCore.Server.IIS.Core.IISServerSetupFilter+<>c__DisplayClass2_0.b__0(IApplicationBuilder app)

InvalidOperationException: Application is running inside IIS process but is not configured to use IIS server.
Microsoft.AspNetCore.Server.IIS.Core.IISServerSetupFilter+<>c__DisplayClass2_0.b__0(IApplicationBuilder app)
Microsoft.AspNetCore.HostFilteringStartupFilter+<>c__DisplayClass0_0.b__0(IApplicationBuilder app)
Microsoft.AspNetCore.Hosting.Internal.AutoRequestServicesStartupFilter+<>c__DisplayClass0_0.b__0(IApplicationBuilder builder)
Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()