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When the credentials are provided by dint of being run on an EC2 instance with an assigned Role, we must be able to fetch the instance metadata from IMDS -- which is precisely the type of internal-IP request that Smokescreen denies. While botocore supports a `proxies` argument to the `Config` object, this is not actually respected when making the IMDS queries; only the environment variables are read from. See https://github.com/boto/botocore/issues/2644 As such, implement S3_SKIP_PROXY by monkey-patching the `botocore.utils.should_bypass_proxies` function, to allow requests to IMDS to be made without Smokescreen impeding them. Fixes #20715.
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