* path: Base directory to where GeoIP data is located or the full path
to where the city or country data files (*.mmdb) are located.
Assumes that both the city and country data sets are located in
this directory; overrides the GEOIP_PATH setting.
* cache: The cache settings when opening up the GeoIP datasets. May be
an integer in (0, 1, 2, 4, 8) corresponding to the MODE_AUTO,
MODE_MMAP_EXT, MODE_MMAP, MODE_FILE, and MODE_MEMORY,
`GeoIPOptions` C API settings, respectively. Defaults to 0,
meaning MODE_AUTO.
* country: The name of the GeoIP country data file. Defaults to
'GeoLite2-Country.mmdb'; overrides the GEOIP_COUNTRY setting.
* city: The name of the GeoIP city data file. Defaults to
'GeoLite2-City.mmdb'; overrides the GEOIP_CITY setting.