Allow CORS in .net application

cors.txt

protected void Application_BeginRequest()
{
    if (Request.Headers.AllKeys.Any(x => x.ToUpper() == "ORIGIN") && Request.HttpMethod.ToUpper() == "OPTIONS")
    {
        Response.Flush();
    }
}

<customHeaders>
	<remove name="X-Powered-By" />
	<add name="X-Frame-Options" value="SAMEORIGIN" />
  
	<add name="Access-Control-Allow-Origin" value="*"/>
	<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS"/>
	<add name="Access-Control-Allow-Headers" value="Content-Type"/>
</customHeaders>