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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 decode(self, binary, url, encoding=None, errors="strict"):
 """ Decode binary to string. :param binary: binary content of a http request. :param url: endpoint of the request. :param encoding: manually specify the encoding. :param errors: errors handle method. :return: str """

        if encoding is None:
            domain = util.get_domain(url)
            if domain in self.domain_encoding_table:
                encoding = self.domain_encoding_table[domain]
                html = binary.decode(encoding, errors=errors)
            else:
                html, encoding, confidence = smart_decode(
                    binary, errors=errors)
                # cache domain name and encoding
                self.domain_encoding_table[domain] = encoding
        else:
            html = binary.decode(encoding, errors=errors)

        return html