If the machine running Nikto only has access to the target host (or update server) via an HTTP proxy, the test can still be performed. Set the PROXY* variables (as described in section 4), then execute Nikto with the -u (-useproxy) command. All connections will be relayed through the HTTP proxy specified in the configuration file.
perl nikto.pl -h 192.168.0.1 -p 80 -u