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Continue to ChatQuery : What causes an empty referrer field in a webserver log file? Given a log line from Apache such as the following: xx.xx.xx.xx - - [04/Jan/2016:10:42:27 -0800] "GET / HTTP/1.1" 200 6861 "-" "Mozilla/5.0 https://vmapp.org/query/124731/What-Causes-An-Empty-Referrer-Field-In-A-Webserver-Log-File-Given-A-Log-Line-From-Apache-Such-As-The-Following-Xx-Xx-Xx-Xx-04-Jan-2016-10-42-27-0800-GET-HTTP-1-1-200-6861-Mozilla-5-0/