Can't get images from https://bibliotheques-specialisees.paris.fr

[julienperret]

I don't know if it comes from the website (limited access?), from the library or from my code (I tried different things), but I can't seem to download the images from, for instance the following ark identifier:
https://bibliotheques-specialisees.paris.fr/ark:/73873/pf0000935116

from gallipy import Resource, Ark
def save(either, filename):
  print('save')
  # Handle exceptions here
  if either.is_left:
    raise either.value
  # Otherwise we can safely unwrap its content.
  with open(filename,'wb') as file:
    file.write(either.value)
  return either  # Enables method chaining.
my_ark = 'https://bibliotheques-specialisees.paris.fr/ark:/73873/pf0000935116'
filename = 'pf0000935116.png'
# Async call: save(either, filename) is a callback method.
#Resource(my_ark).content(startview=1, nviews=17, mode='pdf').map(lambda x: save(x, filename))
ark = Ark.parse(my_ark) # Parse the ark
ark.map(print)
ark.map(lambda x : print(repr(x)))
ark.map(lambda x : print(x.arkid))
#Ark.parse(my_ark).map(Resource).value.iiif_data(view='v0014.simple').map(lambda x: save(x, filename))
Resource(my_ark).iiif_data(view=1).map(lambda x: save(x, filename))
ark.map(lambda x : print(repr(x.arkid)))