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Crawler Plugins hook into the crawling process in order to add advanced functionality.
Plugin-Classmust be set to the complete class name of the implementing class.
void onStartCrawling(Crawler crawler)
Called before the crawling process starts (Crawler::run()).
This may be called multiple times during the lifetime of a plugin instance, but onFinishCrawling() is always called in between.
Parameters: crawler The crawler instance that is about to begin crawling