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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def can_fetch(self, url_info: URLInfo, user_agent: str):
        '''Return whether the URL can be fetched.'''
        key = self.url_info_key(url_info)

        parser = self._parsers[key]
        return parser.is_allowed(user_agent, url_info.url)