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Value Error due to headers format change/

See original GitHub issue

Hi @fabiobatalha,

It seems like crossref api has made some modifications in header format.

{'date': 'Mon, 26 Jul 2021 11:41:59 GMT', 'content-type': 'application/json', 'transfer-encoding': 'chunked', 'access-control-allow-origin': '*', 'access-control-allow-headers': 'X-Requested-With', 'vary': 'Accept-Encoding', 'content-encoding': 'gzip', 'server': 'Jetty(9.4.40.v20210413)', 'x-ratelimit-limit': '50', 'x-ratelimit-interval': '1s', 'x-rate-limit-limit': '50, 50', 'x-rate-limit-interval': '1s, 1s', 'permissions-policy': 'interest-cohort=()', 'connection': 'close'}

‘x-rate-limit-limit’: ‘50, 50’, ‘x-rate-limit-interval’: ‘1s, 1s’,

Running below code

from crossref.restful import Works
works = Works()
w1 = works.query('zika').sample(20)
for item in w1:
    print(item["title"])

is giving following error:

Traceback (most recent call last):
  File "/home/ankush/.config/JetBrains/PyCharm2021.1/scratches/crossref_scratch.py", line 6, in <module>
    for item in w1:
  File "/media/ankush/ContinentalGroun/workplace/open_source/crossrefapi/crossref/restful.py", line 264, in __iter__
    result = self.do_http_request(
  File "/media/ankush/ContinentalGroun/workplace/open_source/crossrefapi/crossref/restful.py", line 80, in do_http_request
    self._update_rate_limits(result.headers)
  File "/media/ankush/ContinentalGroun/workplace/open_source/crossrefapi/crossref/restful.py", line 43, in _update_rate_limits
    self.rate_limits['X-Rate-Limit-Limit'] = int(headers.get('X-Rate-Limit-Limit', 50))
ValueError: invalid literal for int() with base 10: '50, 50'