code: def _browser_init(self):
          
          if self.session:
              return
  
          self.session = requests.Session()
          headers = {}
  
          if self.user_agent:
              headers['User-agent'] = self.user_agent
          self.session.headers.update(headers)
  
          if self._auth_method in [None, "", "HTTPBasicAuth"]:
              if self._auth_username is not None:
                  self.session.auth = (self._auth_username, self._auth_password)
docs: Init the browsing instance if not setup
  
          :rtype: None