Woohoo !! Got it to work!
@yuangteck & @uskiara you were both right.
I added a header for User-Agent as posted here:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36
having tried many other user agents, and I got the image.
Set your headers thus:
