如何使用亚马逊的AWS停止通过http访问对象（文件）

I have tried the following two methods but both of them still allow the file to be accessed using a URL such as https://bucket-example.s3.amazonaws.com/mwnl.json

(The URL is just an example)

$result = $s3Client->putObject(array(
    'ACL'    => 'private',
    'Bucket' => $bucket,
    'Key'    => 'mwnl.json',
    'Body'   => $json
));

and...

$result = $s3Client->putObjectAcl(array(
    'ACL'    => 'private',
    'Bucket' => $bucket,
    'Key'    => 'mwnl.json',
    'Body'   => $json
));