enable debug

README.md

@@ -69,6 +69,7 @@ It's designed to be run as a Docker container and integrated with Traefik v3 for
         *   `INITIAL_RETRY_DELAY_MS`: (Default: `1000`) Initial delay in milliseconds before first retry. Must be a number.
         *   `DNS_TIMEOUT_MS`: (Default: `5000`) DNS resolution timeout in milliseconds. Must be a number.
         *   `HTTP_TIMEOUT_MS`: (Default: `10000`) HTTP request timeout in milliseconds. Must be a number.
+        *   `LOG_LEVEL`: (Default: `info`) Controls verbosity of logs. Valid values are `error`, `warn`, `info`, or `debug`. Use `debug` to see detailed header information and other diagnostic messages.
         *   `TRAEFIK_SERVICE_HOST`: Your public domain for this service (e.g., `webpush.virtonline.eu`).
         *   `TRAEFIK_CERT_RESOLVER`: The name of your TLS certificate resolver configured in Traefik (e.g., `le`, `myresolver`).
 
@@ -191,7 +192,7 @@ If you receive a different response, refer to the Troubleshooting section below.
 ## Troubleshooting
 
 *   **Check Backend Logs:** `docker logs flic-webhook-webpush`. Look for errors related to configuration, file access, JSON parsing, authentication, or sending push notifications.
-    * The server logs all headers received from Flic requests to help with debugging. Look for lines starting with `DEBUG - All headers received:` to see all headers sent by the Flic button.
+    * To see detailed debug information including all headers received from the Flic button, set `LOG_LEVEL=debug` in your .env file.
 *   **Check Traefik Logs:** `docker logs traefik`. Look for routing errors or certificate issues.
 *   **Verify `.env`:** Ensure all required variables are set correctly, especially VAPID keys and Traefik settings.
 *   **Verify `labels`:** Double-check that variables were correctly substituted manually and match your `.env` and Traefik setup.