Send delimiter/max-keys/prefix query parameters empty for ListObjects API

[balamurugana]

Bucket policy at server-side may prevent accessing ListObjects REST API if delimiter/max-keys/prefix query parameters are sent with empty values.

Below is an example valid bucket policy

{
    "Statement": [
        {
            "Action": [
                "s3:ListBucket"
            ],
            "Effect": "Allow",
            "Principal": "*",
            "Resource": [
                "arn:aws:s3:::mybucket"
            ],
            "Condition": {
                "StringEquals": {
                    "s3:prefix": [
                        ""
                    ],
                    "s3:delimiter": [
                        ""
                    ],
                    "s3:max-keys": [
                        1000
                    ]
                }
            }
        }
    ],
    "Version": "2012-10-17"
}

[balamurugana]

Fixed by #984