> For the complete documentation index, see [llms.txt](https://docs.nosto.com/magento/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nosto.com/magento/guides/varnish-and-full-page-caches.md).

# Varnish & Full-Page Caches

If you use Varnish or another full-page cache mechanism, you must exclude certain Nosto blocks (hole punching).

Nosto adds query parameters to the product URLs for tracking purposes. You may encounter a cache-miss when query parameters are appended to the URL. We recommend [modifying your VCL definition to automatically strip out the query parameters added by Nosto](https://help.nosto.com/manuals/how-can-i-exclude-the-nosto-query-parameter-from-my-varnish-vcl-rules).

## Magento Community Edition

Magento CE does not ship with a built-in FPC mechanism and you **must** manually exclude two Nosto blocks. Failure to do so may result in sensitive information leaking across browser sessions.

* [Cart Block](https://github.com/Nosto/nosto-magento/blob/3.5.1/app/design/frontend/base/default/layout/nostotagging.xml#L57)
* [Customer Block](https://github.com/Nosto/nosto-magento/blob/3.5.1/app/design/frontend/base/default/layout/nostotagging.xml#L62)

> **Note:** The plugin uses a feature called hashed cookie identifiers (HCID) to safeguard against the leakage of customer information on Nosto's end.

## Magento Enterprise Edition

If you are using Magento EE's built-in FPC mechanism, you need not worry about hole punching as hole-punching rules are auto-configured.


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# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.nosto.com/magento/guides/varnish-and-full-page-caches.md?ask=<question>&goal=<endgoal>
```

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