How to force a client-side refresh on a new favicon

Browsers usually cache favicons. If you update the favicon of your web site and want all visitors to see the new icon, you need to give the icon a different URL. You will not have this issue if you cache your assets properly, which appends a fingerprint to your image URL (like favicon.ico?432423432):

Copy<link href="<%= image_path('favicon.ico') %>" rel="icon" type="image/vnd.microsoft.icon">