While working in my local development environment at , I encountered the need to make an Ajax call to open a URL and display the response in fancybox. Due to the local development environment, this creates a cross-domain issue. However, once deployed to the server, this issue no longer exists. I'm seeking advice on how to test my Ajax call locally using tools such as Fiddler. I attempted to use Fiddler and modified the Response Header by adding "Access-Control-Allow-Origin", "*", following the steps outlined in this blog post: . Unfortunately, this approach did not work for me. Can anyone suggest a solution?