I can't break it.Help me PLZ

Before creating an issue, first upgrade cfscrape with pip install -U cfscrape and see if you're still experiencing the problem. Please also confirm your Node version (node --version or nodejs --version) is version 10 or higher.

Make sure the website you're having issues with is actually using anti-bot protection by Cloudflare and not a competitor like Imperva Incapsula or Sucuri. And if you're using an anonymizing proxy, a VPN, or Tor, Cloudflare often flags those IPs and may block you or present you with a captcha as a result.

Please confirm the following statements and check the boxes before creating an issue:

[yes] I've upgraded cfscrape with pip install -U cfscrape
[yes] I'm using Node version 10 or higher
[yes] The site protection I'm having issues with is from Cloudflare
[yes] I'm not using Tor, a VPN, or an anonymizing proxy

Python version number

Run python --version and paste the output below:

Python 3.7.4

cfscrape version number

Run pip show cfscrape and paste the output below:

Name: cfscrape
Version: 2.1.1
Summary: A simple Python module to bypass Cloudflare's anti-bot page. See https://github.com/Anorov/cloudflare-scrape for more information.
Home-page: https://github.com/Anorov/cloudflare-scrape
Author: Anorov
Author-email: anorov.vorona@gmail.com
License: UNKNOWN
Location: /Users/seven/opt/anaconda3/lib/python3.7/site-packages
Requires: requests
Required-by:

Code snippet involved with the issue

import cfscrape

scraper = cfscrape.create_scraper()
scraper = cfscrape.create_scraper(delay=10)
web_data = scraper.get("https://sci-hub.tf/10.1109/MCSE.2007.58").content
print(web_data)

Complete exception and traceback

(If the problem doesn't involve an exception being raised, leave this blank)

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
~/opt/anaconda3/lib/python3.7/site-packages/cfscrape/__init__.py in solve_challenge(self, body, domain)
    254                 r"(?:[^{<>]*},\s*(\d{4,}))?",
--> 255                 javascript, flags=re.S
    256             ).groups()

AttributeError: 'NoneType' object has no attribute 'groups'

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
<ipython-input-4-0e4d26f3df49> in <module>
      3 scraper = cfscrape.create_scraper()
      4 scraper = cfscrape.create_scraper(delay=10)
----> 5 web_data = scraper.get("https://sci-hub.tf/10.1109/MCSE.2007.58").content
      6 print(web_data)

~/opt/anaconda3/lib/python3.7/site-packages/requests/sessions.py in get(self, url, **kwargs)
    544 
    545         kwargs.setdefault('allow_redirects', True)
--> 546         return self.request('GET', url, **kwargs)
    547 
    548     def options(self, url, **kwargs):

~/opt/anaconda3/lib/python3.7/site-packages/cfscrape/__init__.py in request(self, method, url, *args, **kwargs)
    127         # Check if Cloudflare anti-bot "I'm Under Attack Mode" is enabled
    128         if self.is_cloudflare_iuam_challenge(resp):
--> 129             resp = self.solve_cf_challenge(resp, **kwargs)
    130 
    131         return resp

~/opt/anaconda3/lib/python3.7/site-packages/cfscrape/__init__.py in solve_cf_challenge(self, resp, **original_kwargs)
    202 
    203         # Solve the Javascript challenge
--> 204         answer, delay = self.solve_challenge(body, domain)
    205         if method == 'POST':
    206             cloudflare_kwargs["data"]["jschl_answer"] = answer

~/opt/anaconda3/lib/python3.7/site-packages/cfscrape/__init__.py in solve_challenge(self, body, domain)
    290             raise ValueError(
    291                 "Unable to identify Cloudflare IUAM Javascript on website. %s"
--> 292                 % BUG_REPORT
    293             )
    294 

ValueError: Unable to identify Cloudflare IUAM Javascript on website. Cloudflare may have changed their technique, or there may be a bug in the script.

Please read https://github.com/Anorov/cloudflare-scrape#updates, then file a bug report at https://github.com/Anorov/cloudflare-scrape/issues."

URL of the Cloudflare-protected page

[https://sci-hub.tf/10.1109/MCSE.2007.58]

URL of Pastebin/Gist with HTML source of protected page

[https://sci-hub.tf/10.1109/MCSE.2007.58]

Anorov / cloudflare-scrape