Amazon s3 如何在使用boto3 create_presigned_post时添加元数据？

要将自定义元数据添加到我使用boto3中的

create\u presigned\u post

上传的文件中。我正在运行以下代码，但得到403响应。下面的代码是借用自。我做错什么了吗

def create_presigned_post(bucket_name, object_name,
                          fields=None, conditions=None, expiration=3600):

    # Generate a presigned S3 POST URL
    s3_client = boto3.client('s3')
    try:
        response = s3_client.generate_presigned_post(bucket_name,
                                                     object_name,
                                                     Fields=fields,
                                                     Conditions=conditions,
                                                     ExpiresIn=expiration)
    except ClientError as e:
        print(e)
        return None

    # The response contains the presigned URL and required fields
    return response

# Generate a presigned S3 POST URL
object_name = 'test-file.txt'
response = create_presigned_post('temp', object_name, fields={'x-amz-meta-test_key': 'test_val'})

# Demonstrate how another Python program can use the presigned URL to upload a file
with open('test-file.txt', 'rb') as f:
    files = {'file': (object_name, f)}
    http_response = requests.post(response['url'], data=response['fields'], files=files)
# If successful, returns HTTP status code 204
print(f'File upload HTTP status code: {http_response.status_code}')

，字段字典将不会自动添加到条件列表中。还必须为元素指定一个条件

response = create_presigned_post(bucket_name, object_name, fields={'x-amz-meta-test_key': 'test-val'}, conditions=[{'x-amz-meta-test_key': 'test-val'}])

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它应该可以工作：）

谢谢！它就像一个符咒我不是从文件中得到的。我认为条件是过滤一些字段。