# Known limitations

This page lists surprising, non-obvious issues and possible privacy shortcomings of Hydrilla & Haketilo proxy as of version 3.0-beta1. You can read about the limitations of Haketilo browser extension (now in maintenance mode) [[Known_limitations_(browser_extension)|here]].

* The proxy only works with HTTP(s) pages and not for example FTP ones.
* Haketilo doesn't have additional features one could expect from a content blocker, e.g.
  * there is currently no option to disable Service Workers while allowing normal scripts to execute and
  * there is currently no option to disable loading of external/third-party fonts, tracking pixels or other strategies that are used by Google and similar companies to snoop on internet users.
* There is currently no facility to anonymize queries Haketilo makes to its script repositories. This means admin of a [[Hydrilla:Wiki|Hydrilla]] instance could theoretically see the sites for which a Haketilo user downloaded custom scripts.
* Haketilo might still be missing:
  * UI Translations
  * Accessiblity features
  * Mobile support
* Haketilo currently tries to prevent the browser from caching HTTP responses. This is needed to make it function properly on some sites. Unfortunately, this behavior may cause a big performance hit.
* If user's browser gets to cache a page in spite of Haketilo's anti-caching measures, it might later be unable to "pick up" changes in Haketilo configuration that affect the cached page.
* If a user temporarily disables the proxy and continues to use the browser on a page that was modified by Haketilo, page's website might learn a Haketilo-generated token that ought to remain private.
* There are almost certainly other bugs.