Once the replication meta-object has authorized for it, the Web server uses oneof its standard document delivery modules to answer the request. These can bemodules that deliver static documents, or modules that generate a document onrequest.Certain replication policies require taking actions at other times than requesttime, such as periodically checking for a document’s freshness, sending invalidationsto replicas when the master copy is updated, and processing incoming invalidations.To do so, meta-objects can register to local services for being invokedwhen certain events take place. For example, a meta-object can request to be wokenup periodically or when a given file is updated
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