# File lib/fog/compute/openstack/requests/create_os_interface.rb, line 8
        def create_os_interface(server_id, options={})
          body = {
            'interfaceAttachment' => {}
          }

          if options[:port_id]
            body['interfaceAttachment']['port_id'] = options[:port_id]
          elsif options[:net_id]
            body['interfaceAttachment']['net_id'] = options[:net_id]
          end

          if options[:ip_address]
            body['interfaceAttachment']['fixed_ips'] = {ip_address: options[:ip_address]}
          end

          request(
            :body    => Fog::JSON.encode(body),
            :expects => [200, 201, 202, 204],
            :method  => 'POST',
            :path    => "servers/#{server_id}/os-interface"
          )
        end