为什么我来自 Amazon S3 的图像 url 具有 AWSaccesskey 和过期时间,即使我创建了存储桶 public?

Why does my image url from Amazon S3 have AWSaccesskey and expiration even though I made the bucket public?

这是我添加的政策:

{
  "Version": "2012-10-17",
  "Statement": [
    {
        "Sid": "MakeItPublic",
        "Effect": "Allow",
        "Principal": "*",
        "Action": "s3:GetObject",
        "Resource": "arn:aws:s3:::bucketname/*"
    }
  ]
}

我创建了一个 IAM 并将 AmazonS3FullAccess 附加到该 IAM。

在我的 rails 应用程序中,我这样显示图片:

- @pictures.each do |picture|
  %img{src: picture.image_url}

生成的 url 类似于:

https://leaguedraw.s3-us-west-2.amazonaws.com/uploads/73dfe6c6-0c25-496c-be9f-6f2beb75d7c3.png?AWSAccessKeyId=myaccesskey&Expires=1434472944&Signature=d1vIYOQt410%2BgcXs6%2BATSCsG2Mk%3D

当我只想要这个时:

https://leaguedraw.s3-us-west-2.amazonaws.com/uploads/73dfe6c6-0c25-496c-be9f-6f2beb75d7c3.png

我还需要做什么才能生成后者url?

附加信息:使用载波 gem 和载波 aws gem

原来我需要更改配置文件中的acl

config.aws_acl = :'public-read'

config.aws_acl = :public_read

尽管文档说要使用 :'public-read'