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One workaround is to compute MD5s yourself and put them in a custom header (such as is done by [s4cmd](https://github.com/bloomreach/s4cmd)).\n -\t🔸**US Standard region:** Previously, the us-east-1 region (also known as the US Standard region) was replicated across coasts, which led to greater variability of latency. Effective Jun 19, 2015 this is [no longer the case](https://forums.aws.amazon.com/ann.jspa?annID=3112). All Amazon S3 Regions now support read-after-write consistency. Amazon S3 also renamed the US Standard Region to the US East (N. Virginia) Region to be consistent with AWS regional naming conventions.\n+-\t🔸When configuring ACLs on who can access the bucket and contents, a predefined group exists called **[Authenticated Users](http://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html)**. This group is often used, incorrectly, to restrict S3 resource access to authenticated users of the owning account. If granted, the AuthenticatedUsers group will allow S3 resource access to all authenticated users, across all AWS accounts.  A typical use case of this ACL is used in conjuction with the [requester pays](http://docs.aws.amazon.com/AmazonS3/latest/dev/RequesterPaysBuckets.html) functionality of S3.","path":"README.md","position":4,"original_position":4,"commit_id":"50813fd70fdd1965c14aa4003b651024c8cc0f00","original_commit_id":"50813fd70fdd1965c14aa4003b651024c8cc0f00","user":{"login":"max-zanko","id":10171129,"avatar_url":"https://avatars.githubusercontent.com/u/10171129?v=3","gravatar_id":"","url":"https://api.github.com/users/max-zanko","html_url":"https://github.com/max-zanko","followers_url":"https://api.github.com/users/max-zanko/followers","following_url":"https://api.github.com/users/max-zanko/following{/other_user}","gists_url":"https://api.github.com/users/max-zanko/gists{/gist_id}","starred_url":"https://api.github.com/users/max-zanko/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/max-zanko/subscriptions","organizations_url":"https://api.github.com/users/max-zanko/orgs","repos_url":"https://api.github.com/users/max-zanko/repos","events_url":"https://api.github.com/users/max-zanko/events{/privacy}","received_events_url":"https://api.github.com/users/max-zanko/received_events","type":"User","site_admin":false},"body":"I'd probably mark this gotcha with ❗, since it is a security issue if configured incorrectly.\r\nAlso, let's bold \"all authenticated users, across all AWS accounts\".\r\nStyle: one space before \"A typical use...\"","created_at":"2016-10-19T23:25:39Z","updated_at":"2016-10-19T23:25:39Z","html_url":"https://github.com/open-guides/og-aws/pull/227#discussion_r84188294","pull_request_url":"https://api.github.com/repos/open-guides/og-aws/pulls/227","_links":{"self":{"href":"https://api.github.com/repos/open-guides/og-aws/pulls/comments/84188294"},"html":{"href":"https://github.com/open-guides/og-aws/pull/227#discussion_r84188294"},"pull_request":{"href":"https://api.github.com/repos/open-guides/og-aws/pulls/227"}}},"pull_request":{"url":"https://api.github.com/repos/open-guides/og-aws/pulls/227","id":89674221,"html_url":"https://github.com/open-guides/og-aws/pull/227","diff_url":"https://github.com/open-guides/og-aws/pull/227.diff","patch_url":"https://github.com/open-guides/og-aws/pull/227.patch","issue_url":"https://api.github.com/repos/open-guides/og-aws/issues/227","number":227,"state":"open","locked":false,"title":"S3 ACL Gotcha","user":{"login":"dragonndev","id":3311715,"avatar_url":"https://avatars.githubusercontent.com/u/3311715?v=3","gravatar_id":"","url":"https://api.github.com/users/dragonndev","html_url":"https://github.com/dragonndev","followers_url":"https://api.github.com/users/dragonndev/followers","following_url":"https://api.github.com/users/dragonndev/following{/other_user}","gists_url":"https://api.github.com/users/dragonndev/gists{/gist_id}","starred_url":"https://api.github.com/users/dragonndev/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dragonndev/subscriptions","organizations_url":"https://api.github.com/users/dragonndev/orgs","repos_url":"https://api.github.com/users/dragonndev/repos","events_url":"https://api.github.com/users/dragonndev/events{/privacy}","received_events_url":"https://api.github.com/users/dragonndev/received_events","type":"User","site_admin":false},"body":"I added some wording around an S3 ACL that has proven problematic at past employers. 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