A simple Google Chrome extension that shows if a page being served up via a Varnish web accelerator is fresh or not.

Currently this addon consists of a single toolbar button that changes state based on detected HTTP headers.

The button icon appears gray/disabled when no special HTTP headers are detected.

The button icon becomes Varnish-blue when the HTTP header Via is detected containing the string "varnish" or if the Age HTTP header appears:

The button becomes red-ish in color when the HTTP header X-Cache is detected containing the string "MISS":

The button becomes green in color when the HTTP header X-Cache is detected containing the string "HIT":

The label text is updated to reflect the number of cache hits if the HTTP header X-Cache-Hits is present.