Jeremy Lin 2f9ac61a4e Add support for external icon services ...

If an external icon service is configured, icon requests return an HTTP
redirect to the corresponding icon at the external service.

An external service may be useful for various reasons, such as if:

* The Vaultwarden instance has no external network connectivity.
* The Vaultwarden instance has trouble handling large bursts of icon requests.
* There are concerns that an attacker may probe the instance to try to detect
  whether icons for certain sites have been cached, which would suggest that
  the instance contains entries for those sites.
* The external icon service does a better job of providing icons than the
  built-in fetcher.

2021-12-20 01:34:31 -08:00

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