无法将blob存储文件下载到内存流

import requests
from io import BytesIO
from qcloud_cos import CosConfig
from qcloud_cos import CosS3Client

# 配置腾讯云COS SDK
secret_id = 'your_secret_id'
secret_key = 'your_secret_key'
region = 'your_region'
config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key)
client = CosS3Client(config)

# 获取blob存储文件的URL
bucket = 'your_bucket'
key = 'your_file_key'
response = client.get_presigned_url(
    Method='GET',
    Bucket=bucket,
    Key=key,
    Expires=3600  # URL的有效期，单位为秒
)
url = response['PresignedUrl']

# 发送HTTP GET请求获取文件内容
headers = {
    'Content-Type': 'application/octet-stream',
    'Content-Disposition': 'attachment; filename="your_file_name"'
}
response = requests.get(url, headers=headers)

# 将响应内容保存到内存流中
memory_stream = BytesIO(response.content)

# 可以在这里对内存流进行进一步处理，如读取、解析、修改等