Use IMDSv2 to get instance metadata #102
                
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Issue #95
Current version of script breaks when IMDSv2 is enforced on EC2 instances(
"InstanceMetadataOptions": {
"HttpTokens": "required",
} )
Description of changes:
To improve security, AWS recommend to use IMDSv2, the session-oriented communication to get instance metadata.https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html. This change is backward compatible with IMDSv1.
Also updated the request to get the region using
placement/regionthis feature was released by AWS on 2020-08-24 - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-categories.htmlBy submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.