I started using a static. subdomain but YSlow still says I am not cookie-free?

Question

I changed all my static content references to use the static. subdomain instead of www. but YSlow still says I am not using cookie-free domains for my static content. What else do I need to do?

Example: http://www.justineyandlephotography.com

Answer 1

What else do I need to do?

To be completely cookie-free, you should use a different domain, not subdomain because cookies can be shared between subdomains. For example take a look at how Stack Overflow does it:

• main domain: stackoverflow.com
• cookie free domain for static resources: sstatic.net

So in your case:

• main domain: www.justineyandlephotography.com
• cookie free domain for static resources: anything that doesn't end up with justineyandlephotography.com

It basically means that you need to purchase an additional domain if you don't already have one.

Answer 2

You don't need an additional domain, you can use sub domain. And yslow will not detect it, if you are using cloudflare or any other CDN which sends a cookie with every request.