| A | ↛ | EmptyCrawlObserver removed |
| ⇢ | A | Crawler::handleCrawled() added | |
| ⇢ | A | Crawler::handleCrawlFailed() added | |
| A | ↛ | Crawler::handleResponse() removed | |
| A | ↛ | EmptyCrawlObserver::willCrawl() removed | |
| A | ↛ | EmptyCrawlObserver::hasBeenCrawled() removed | |
| A | ↛ | EmptyCrawlObserver::finishedCrawling() removed |