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I’m using the WebDevHelper toolbar for Internet Explorer to troubleshoot HTTP requests/roundtrips on my SSL site and noticed that IE re-downloads my CSS :hover images every time they are triggered. This causes a huge amount of roundtrips.
How can I prevent this from happening?
Edit: All static content is served with cache-control: public, so images, javascript etc. are cached in Firefox and Chrome. This problem is IE specific.
If the images are being delivered from a different hostname than your main page, then you’re hitting the artifact described here:
http://blogs.msdn.com/ieinternals/archive/2010/04/21/Internet-Explorer-May-Bypass-Cache-for-Cross-Domain-HTTPS-Content.aspx