This is a Browser Extension to quickly reference if a page was served from Varnish Cache.
The extension has the following states:
Varnish could not be found.
Varnish is present.
Cache hit.
Cache miss.
The extension will look for the x-varnish-cache or x-varnish headers. If found, it marks Varnish as present.
If x-varnish-cache is hit, it marks Varnish as hit.
If x-varnish-cache is miss, it marks Varnish as miss.
If x-varnish-cache can't be found, it will inspect x-varnish. If it has two ids (i.e. 273036 732728), it marks Varnish as hit. If it has only one id (i.e. 273036), it marks Varnish as miss.