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anubis-mirror/docs/docs/admin/configuration/challenges/preact.mdx
Xe Iaso 4ead3ed16e fix(config): deprecate the report_as field for challenges (#1311)
* fix(config): deprecate the report_as field for challenges

This was a bad idea when it was added and it is irresponsible to
continue to have it. It causes more UX problems than it fixes with
slight of hand.

Closes: #1310
Closes: #1307
Signed-off-by: Xe Iaso <me@xeiaso.net>

* fix(policy): use the new logger for config validation messages

Signed-off-by: Xe Iaso <me@xeiaso.net>

* docs(admin/thresholds): remove this report_as setting

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>
2025-11-25 23:25:17 -05:00

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# Preact
The `preact` challenge sends the browser a simple challenge that makes it run very lightweight JavaScript that proves the client is able to execute client-side JavaScript. It uses [Preact](https://www.npmjs.com/package/preact) (a lightweight client side web framework in the vein of React) to do this.
To use it in your Anubis configuration:
```yaml
# Generic catchall rule
- name: generic-browser
user_agent_regex: >-
Mozilla|Opera
action: CHALLENGE
challenge:
difficulty: 1 # Number of seconds to wait before refreshing the page
algorithm: preact
```
This is the default challenge method for most clients.