How to extract content disposition in pyshark

Question

In layer http packet has content disposition but I cannot get this with pyshark in python

I use packet.http.content_disposition but it not display

import pyshark

def capture_live_packet(network_interface):
    capture = pyshark.LiveCapture(interface=network_interface, display_filter='http')
    for packet in capture.sniff_continuously():
        print(packet.http.content_disposition)