@classmethod
def check_cache(cls, url):
    """Checks if url already have a response.
        Stop from calling the request method more than once.
        Great for saving mobile data on mobile devices.
        """
    url = url.strip()
    try:
        if url in cls.cache.keys():
            cls.cache[url]['count'] += 1
            return cls.cache[url]['response']
    except MemoryError:
        cls.clear_cache()
    except:
        pass
