Deploying website with cookie-free domain path update for images and other resources.

Question

I'm working on as asp.net application. The application is reasonably large and involves lot of pages with many reference images and scripts. I have hosted such content on a cookie-free sub-domain.

My problem is - I have to manually update the path for all images and scripts upon deployment, by making them absolute-references to cookie-free domain content from relative-references of actual domain. How do I automate this ? Has anybody done this ?

StackOverflow also uses cookie-free domain for various images on the site. Here's example upvote image which loaded from http://sstatic.net/so/img/vote-arrow-up.png

Answer 1

I solved a similar problem with custom controls (Images, etc.). Some I derived from existing controls (Image) some I created new.

Within these Controls you could decide if you are in your dev environment or in production and render/change your links.

EDIT: Add some example code. Note! This code is for demonstration purpose only! It's not perfekt!

public class ExternalImage : System.Web.UI.WebControls.Image
{
    protected override void OnPreRender(EventArgs e)
    {
        base.OnPreRender(e);
        if (System.Configuration.ConfigurationManager.AppSettings["IsDev"] != "true")
        {
            this.ImageUrl = System.Configuration.ConfigurationManager.AppSettings["CookieFreeDomain"] + this.ImageUrl;
        }
    }
}

Answer 2

You can use tag transforms or control adapters.

In case it helps, I cover both approaches in my book, along with code examples: Ultra-Fast ASP.NET