old_contents: from bs4 import BeautifulSoup
  from urllib.request import urlopen
  from urllib.request import Request
  from .const import constant
  
  class BSOpener(object):
      """ A wrapper arround urllib and BeautifulSoup used a helper for url requests """
      # TODO: make this class a singleton
  
      class _Const():
          """ Contains the constants used in BSOpener class """
          
          @constant
          def HEADERS():
              """ Headers to send with all url requests """
              return {"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
                      "User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36"}
  
      def __init__(self):
          self.CONST = self._Const()
  
      def bsopen(self, url, headers=None):
          if headers is None:
              headers=self.CONST.HEADERS
  
          req = Request(url=url, headers=headers)
          return BeautifulSoup(urlopen(req), "html.parser")
  
new_contents: from bs4 import BeautifulSoup
  from urllib.request import urlopen
  from urllib.request import Request
  from .const import constant
  
  class BSOpener(object):
      """ A wrapper arround urllib and BeautifulSoup used a helper for url requests """
      # TODO: make this class a singleton
  
      class _Const():
          """ Contains the constants used in BSOpener class """
          
          @constant
          def HEADERS():
              """ Headers to send with all url requests """
              return {"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
                      "User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36"}
  
      def __init__(self):
          self.CONST = self._Const()
  
      def bsopen(self, url, headers=None):
          if headers is None:
              headers=self.CONST.HEADERS
  
          req = Request(url=url, headers=headers)
          try:
              html = urlopen(req)
          except urllib.error.HTTPError:
              print("WARNING: exception during opening url: " + url)
              return None
              
          return BeautifulSoup(html, "html.parser")
  
subject: Add handler for case of HTTP errors case.