alibabacloud-gateway-fc/python/alibabacloud_gateway_fc/client.py [629:668]:
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        self,
        headers: Dict[str, str],
    ) -> str:
        canonicalized_headers = ''
        sorted_headers = await self.get_signed_headers_async(headers)
        for header in sorted_headers:
            canonicalized_headers = f'{canonicalized_headers}{header}:{StringClient.trim(headers.get(header))}\n'
        return canonicalized_headers

    def get_signed_headers(
        self,
        headers: Dict[str, str],
    ) -> List[str]:
        headers_array = MapClient.key_set(headers)
        sorted_headers_array = ArrayClient.asc_sort(headers_array)
        tmp = ''
        separator = ''
        for key in sorted_headers_array:
            lower_key = StringClient.to_lower(key)
            if StringClient.has_prefix(lower_key, 'x-acs-') or StringClient.equals(lower_key, 'host') or StringClient.equals(lower_key, 'content-type'):
                if not StringClient.contains(tmp, lower_key):
                    tmp = f'{tmp}{separator}{lower_key}'
                    separator = ';'
        return StringClient.split(tmp, ';', None)

    async def get_signed_headers_async(
        self,
        headers: Dict[str, str],
    ) -> List[str]:
        headers_array = MapClient.key_set(headers)
        sorted_headers_array = ArrayClient.asc_sort(headers_array)
        tmp = ''
        separator = ''
        for key in sorted_headers_array:
            lower_key = StringClient.to_lower(key)
            if StringClient.has_prefix(lower_key, 'x-acs-') or StringClient.equals(lower_key, 'host') or StringClient.equals(lower_key, 'content-type'):
                if not StringClient.contains(tmp, lower_key):
                    tmp = f'{tmp}{separator}{lower_key}'
                    separator = ';'
        return StringClient.split(tmp, ';', None)
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