The code does not work on the server, although it works on a computer.

import requests
POSTFIX= '? __ a= 1'
HEADERS= {
    'accept': 'text /html, application /xhtml + xml, application /xml; q= 0.9, image /avif, image /webp, image /apng, * /*; q= 0.8, application /signed-exchange; v= b3; q= 0.9 ',
    'user-agent': 'Mozilla /5.0 (X11; Linux x86_64) AppleWebKit /537.36 (KHTML, like Gecko) Chrome /88.0.4324.96 Safari /537.36'
}
def get_json (url):
    page= requests.get (url, headers= HEADERS)
    json= page.json ()
    return json
def get_images_link (path):
    images_link= path
    return images_link
def get_videos_link (path):
    videos_link= path
    return videos_link
def calculate_the_type (path):
    if path ['__ typename']== 'GraphImage':
        return 'photo'
    else:
        return 'video'
def get_links (url):
    if url.endswith ('? utm_source= ig_web_copy_link'):
        url= url [: url.find ('? utm_source= ig_web_copy_link')]
    url= url [: url.find ("? igshid=")]
    json= get_json (url + POSTFIX)
    links= {}
    try:
        path= json ['graphql'] ['shortcode_media'] ['edge_sidecar_to_children'] ['edges']
        number_of_objects= 0
        for obj in path:
            number_of_objects += 1
        for i in range (number_of_objects):
            if calculate_the_type (path [i] ['node'])== 'photo':
                links [get_images_link (path [i] ['node'] ['display_url'])]= 'photo'
            else:
                links [(get_videos_link (path [i] ['node'] ['video_url']))]= 'video'
    except KeyError:
        path= json ['graphql'] ['shortcode_media']
        if calculate_the_type (path)== 'photo':
            links [get_images_link (path ['display_url'])]= 'photo'
        else:
            links [get_videos_link (path ['video_url'])]= 'video'
    return links
if __name__== '__main__':
    link= str (input ('Enter a link to the object:'))
    urls= get_links (link)
    for key in urls:
        print (key, urls [key])

Error text

Traceback (most recent call last):
  File "test.py", line 60, in <
module >
    urls= get_links (link)
  File "test.py", line 36, in get_links
    json= get_json (url + POSTFIX)
  File "test.py", line 12, in get_json
    json= page.json ()
  File "/code/photo_taker/venv/lib/python3.8/site-packages/requests/models.py", line 900, in json
    return complexjson.loads (self.text, ** kwargs)
  File "/usr/lib/python3.8/json/__init__.py", line 357, in loads
    return _default_decoder.decode (s)
  File "/usr/lib/python3.8/json/decoder.py", line 337, in decode
    obj, end= self.raw_decode (s, idx= _w (s, 0). end ())
  File "/usr/lib/python3.8/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError ("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)