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cache-purge.md

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Prerendering Cache Purging

Full cache purging:

In the case of significant changes on a website, cached results can be purged. Full cache purging available once per 2 hours.

Purge Full Pre-rendering Cache Screenshot

Individual page cache purge:

While full cache purging is limited by time-frame. The individually cached page can be purged anytime without limits. To purge single page from cache "Cache ID" has to be obtained in response headers as X-Prerender-Id.

Prerendering Id Header Screenshot Purge Single Page from Prerendering Cache Screenshot

Purge aggressively cached pages

The reason why you may not found x-prerender-id header in DevTools is aggressive caching headers or usage of ServiceWorker or AppCache, to avoid this issue please follow next steps (in Chrome, Opera, Brave, and other Chromium-based browser):

  1. Open new Private window
  2. Open URL with appended ?_escaped_fragment_=
  3. Open "Developer Tools"
  4. In "Developer Tools" go to "Network" tab
  5. Check "Disable Cache" checkbox
  6. Reload/Refresh page
  7. In "Network" tab select /?_escaped_fragment_= document (should be the first)
  8. In opened area make sure "Header" tab is selected
  9. In "Response Headers" section find x-prerender-id header

Notes:

While cache is purged from Pre-rendering engine it may remain cached in intermediate caching layers from few minutes to several days, it depends on selected "Cache TTL" and rendering endpoint.