Skip call to instance metadata host if region is specified #360
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Hey, thanks for the awesome work on this gem 👍
This PR avoids an extra fetch if region is specified.
The main benefit isn't performance, but rather permissions. For containers, AWS recommends blocking the instance metadata host (with
iptables) so containers running on Amazon ECS don't have access to the underlying EC2 instance credentials.http://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-iam-roles.html