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This allows 'avahi-daemon' to advertise http service when receiving query on '_http._tcp.local' service. But if the 'workstation' is already enabled in the above config, this 'http' service is not mandatory for this feature. The same applies to the 'https' service.
At least one of the 'workstation' or 'http' or 'https' services has to be defined in the 'Avahi' for this local datastore feature to work.