Allow a Blazor App app to be iframed in another app

Program.cs

 // Configure the HTTP request pipeline
 // To allow this Blazor App app to be iframed in another app
 app.Use(async (context, next) =>
 {
     // How to display the app in an iframe
     context.Response.OnStarting(() =>
     {
         // Remove X-Frame-Options header
         context.Response.Headers.Remove("X-Frame-Options");

         // Remove Content-Security-Policy header
         context.Response.Headers.Remove("Content-Security-Policy");

         // Add custom CSP to allow iframing from anywhere
         context.Response.Headers.Append("Content-Security-Policy",
             "default-src 'self'; " +
             "script-src 'self'; " +
             "style-src 'self' 'unsafe-inline'; " +
             "img-src 'self' data:; " +
             "font-src 'self'; " +
             "frame-ancestors *;");

         return Task.CompletedTask;
     });

     await next();
 });