| EXPERIMENTS\_LIST\_REFRESH | string | "300000" | Time to wait before refresh experiments list in `milliseconds` |
| GATEWAY\_SERVER | string | none | Indicate the Gateway's endpoint. Used when the Gateway is behind the Frontend (reverse proxy) |
| EXTERNAL\_MIP\_PROTOCOL | string | https | Indicate the protocol should be forwarded to the Gateway. |
| ERROR\_LOG\_LEVEL | string | WARN | Level is the minimum level to emit, and is inclusive. Possible levels: DEBUG, INFO, WARN, ERROR, PANIC, and FATAL. See [Caddy logs level](https://caddyserver.com/docs/json/logging/logs/level/). |
#### Matomo
Matomo is an open source alternative to Google Analytics.
| MATOMO\_URL | string \| undefined | undefined | Base url for matomo scripts and data reporting. This parameter is `required` if Matomo is `enabled` |
| MATOMO\_SITE\_ID | string \| undefined | undefined | Matomo Website ID. This parameter is required if `Matomo` is `enabled`. |
#### Caddyfile configuration
The frontend container has a simple implementation of Caddyfile, located in `/etc/caddy/Caddyfile`. If you are using Docker compose you can easily overwrite by specifying a volume :