Remove the sf_appPath javascript variable from Sitefinity pages

RemoveSfAppPath.cs

private void SystemManager_ApplicationStart(object sender, EventArgs e)
{
    // remove the sf_appPath script from the header
    EventHub.Subscribe<IPagePreRenderCompleteEvent>(evt => PagePreRenderCompleteEvent(evt));
}
 
private void PagePreRenderCompleteEvent(IPagePreRenderCompleteEvent evt)
{
    if (!SystemManager.IsDesignMode)
    {
        if (evt.PageSiteNode.Url.Contains("/amp/"))
        {
            try
            {
                // we are in an amp page so
                // we should remove the sf_appPath from the head
                var page = evt.Page;
 
                var sfAppPathScript = (from ctrls in page.Header.Controls.OfType<LiteralControl>()
                                       where ctrls.Text.Contains("var sf_appPath=")
                                       select ctrls).FirstOrDefault();
 
                if (sfAppPathScript != null)
                {
                    page.Header.Controls.Remove(sfAppPathScript);
                }
                
                // fix the canonnical url of the amp page as well
                // by default it would point to the same amp page
                // e.g. <link rel="canonical" href="https://site.com/en/amp/home">
                // we want it to point to the main page
                var canonical = (from ctrls in page.Header.Controls.OfType<HtmlLink>()
                                 where ctrls.Attributes["rel"].Equals("canonical", StringComparison.CurrentCultureIgnoreCase)
                                 select ctrls).FirstOrDefault();
                if (canonical != null)
                {
                    page.Header.Controls.Remove(canonical);
                }

                canonical = new HtmlLink();
                canonical.Attributes.Add("rel", "canonical");
                // remove the /amp/ path from the URL
                var href = evt.PageSiteNode.Url.Replace("/amp/", "/");
                // resolve the url as absolute
                href = Telerik.Sitefinity.Web.RouteHelper.ResolveUrl(href, Telerik.Sitefinity.Web.UrlResolveOptions.Absolute);
                canonical.Href = href;

                page.Header.Controls.Add(canonical);
            }
            catch (Exception e)
            {
                Log.Write(e);
                // continue, do not break the page
            }
        }
    }
}