If 3rd party notices is a url make sure it is valid

[sayedihashimi]

If 3rd party notices is a url make sure it is valid, i.e. 2xx and other status code that represents success.

Example: https://github.com/dotnet/aspnetcore/blob/main/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorServerWeb-CSharp/.template.config/template.json#L15