Each of the three demo examples for ZOO run and return expected results. The user experience is excellent. The following errors are found in the apache logs, only by inspection:
[Thu Aug 23 22:46:38.685205 2018] [mpm_prefork:notice] [pid 1531] AH00163: Apache/2.4.29 (Ubuntu) mod_fcgid/2.3.9 mod_wsgi/4.5.17 Python/2.7 configured -- resuming normal operations
[Thu Aug 23 22:46:38.685247 2018] [core:notice] [pid 1531] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 23 22:57:09.236719 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: <<: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.238449 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: error: line 64: character not allowed ':' : /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.238529 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: error: line 64: character not allowed ':' : /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.238566 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: {}{}{}{}{}{}{}{}: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.241671 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: error: line 108: character not allowed ',' : /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.241732 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: error: line 108: character not allowed ',' : /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.244325 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: error: line 132: character not allowed ':' : /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.244386 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: error: line 132: character not allowed ':' : /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.246863 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: {}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.247003 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: {}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.247171 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: {}{}{}{}{}{}{}{}{}{}: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.250512 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: <: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.254955 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: {}{}{}{}: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.255984 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: {}{}{}{}: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:57:09.256609 2018] [cgi:error] [pid 3526] [client 127.0.0.1:44892] AH01215: {}{}{}{}: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/ogr-example.html
[Thu Aug 23 22:58:00.368457 2018] [cgi:error] [pid 1558] [client 127.0.0.1:45010] AH01215: ERROR 6: EPSG PCS/GCS code 900913 not found in EPSG support files. Is this a valid EPSG coordinate system?: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/cgal.html
[Thu Aug 23 22:58:00.376549 2018] [cgi:error] [pid 1558] [client 127.0.0.1:45010] AH01215: ERROR 6: EPSG PCS/GCS code 900913 not found in EPSG support files. Is this a valid EPSG coordinate system?: /usr/lib/cgi-bin/zoo_loader.cgi, referer: http://localhost/zoo-demo/cgal.html
I also see a javascript error