Usage

The admin page

Website > Full Page Cache shows the hit rate of the last 7 days, stored pages, disk use, the warmer and the reasons pages were not used. Hit and bypass counts are sampled to avoid a database write on every view, so they are close, not exact.

What a visitor gets

Visitor	Page
Guest with nothing in the session	Stored page
Guest who viewed products	Stored page, unless the page shows a Recently viewed block; then a normal page with their own list
Guest with a cart, wish list or compare list	Normal page
Signed in customer, or a visitor remembered by the store	Normal page
A visitor with a message waiting (for example after a form error)	Normal page
Search engine crawler	Its own stored copy

Checkout, cart, account, search and all AJAX requests are never stored. POST requests and pages that are not status 200 are never stored.

When pages are dropped

Change	Result
Price, stock, name, description, options, categories of a product	Pages that show this product
Category, content page, block, layout, menu, theme setting, promotion, currency, language, tax, SEO name, add-on or storefront change	All pages
Clear cache in the admin panel	All pages
An active promotion starts or ends	The page expires at that moment

Warmer

Press Warm now on the admin page, or add a nightly cron job in your hosting panel:

php /path/to/your/store/admin.php --dispatch=kv_full_page_cache.cron

The job removes expired pages, then requests the home page, categories, content pages, your most popular products and vendor pages, one at a time, on desktop and phone. It warms the default language and currency.

Clearing pages

Use Clear next to a section, or Clear all pages. The core Clear cache does the same.

Reading the header

Open the browser developer tools, reload, and look at the X-Kv-Fpc response header of the page:

Value	Meaning
HIT	Sent from the cache
MISS	Normal page, being stored
BYPASS cart	Normal page; the reason follows
none	The add-on is off, or the request is not a storefront page

To see a normal page for comparison, add any unknown parameter: ?nocache=1.