Logging - internetarchive/heritrix3 GitHub Wiki

To enable text console logging of authentication interactions, set the FetchHTTP and PreconditionEnforcer log levels to fine

org.archive.crawler.fetcher.FetchHTTP.level = FINE
org.archive.crawler.prefetch.PreconditionEnforcer.level = FINE

This is done by editing the logging.properties file under the conf directory.