How to use the cloudscraper.get_tokens function in cloudscraper

with self._lock:
                        
                        ncs = list( self._network_contexts )
                        snc = self._session_network_context
                        
                    
                    headers = self.engine.domain_manager.GetHeaders( ncs )
                    
                    if 'User-Agent' not in headers:
                        
                        raise HydrusExceptions.CloudFlareException( 'No User-Agent set for hydrus!' )
                        
                    
                    user_agent = headers[ 'User-Agent' ]
                    
                    ( cf_tokens, user_agent ) = cloudscraper.get_tokens( self._url, browser = { 'custom' : user_agent } )
                    
                    session = self.engine.session_manager.GetSession( snc )
                    
                    cf_cookies = [ cookie for cookie in session.cookies if cookie.name.startswith( '__cf' ) ]
                    
                    for cookie in cf_cookies:
                        
                        session.cookies.clear( cookie.domain, cookie.path, cookie.name )
                        
                    
                    domain = '.{}'.format( ClientNetworkingDomain.ConvertURLIntoSecondLevelDomain( self._url ) )
                    path = '/'
                    expires = HydrusData.GetNow() + 30 * 86400
                    secure = True
                    rest = { 'HttpOnly' : None, 'SameSite' : 'None' }