Matching priority of the user-defined rule, whitelist, blacklist, and predefined filtering

The matching sequence is whitelist -> blacklist -> user-defined -> predefined.
If a URL matches the whitelist, the access is permitted. Otherwise, the device searches for a match of the URL in the blacklist. If a match is found in the blacklist, the access is blocked. If no, the device continues to search for a match of this URL in the user-defined categories. If a match is found, and the action for the matched category is Block, the access is blocked. If no match is found, the device continues to search for a match of this URL in the predefined rules.

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