# File lib/fog/openstack/requests/compute/list_security_groups.rb, line 6
        def list_security_groups(server_id = nil)
          path = "os-security-groups.json"
          if server_id
            path = "servers/#{server_id}/#{path}"
          end
          request(
            :expects  => [200],
            :method   => 'GET',
            :path     => path
          )
        end