netFrameworkVersion in Azure App Services Api App

Question

I'm configuring a api app in azure with bicep. This is a dotnet core 3.1 app. For netFrameworkVersion i provide 'v3.1', this however doesn't work. The deployment of the Bicep template does work, but my application does not. The value of .NET version is empty in the portal.

When i manually change the version in the portal, and do an export of my app, the returned ARM template is sets netFrameworkVersion to 'v4.0'. I am very confused, what is happening here? I can't seem to find any documentation about this.

Answer 1

You need to specify the CURRENT_STACK metadata inside the siteConfig property:

resource webapp 'Microsoft.Web/sites@2018-11-01' = {
  ...
  properties: {
    ...
    siteConfig: {
      ...
      metadata: [
        {
          name: 'CURRENT_STACK'
          value: 'dotnetcore'
        }
      ]
      ...
    }
    ...
  }
}