By default, AWS Security Token Service (STS) is available as a global
service, and all STS requests go to a single endpoint at
https://sts.amazonaws.com
. AWS recommends using Regional STS endpoints
to reduce latency, build in redundancy, and increase session token
availability. For information about Regional endpoints for STS, see AWS Regions and Endpoints
in the AWS General Reference.
If you make an STS call to the global endpoint, the resulting session
tokens might be valid in some Regions but not others. It depends on the
version that is set in this operation. Version 1 tokens are valid only
in AWS Regions that are available by default. These tokens do not work
in manually enabled Regions, such as Asia Pacific (Hong Kong). Version 2
tokens are valid in all Regions. However, version 2 tokens are longer
and might affect systems where you temporarily store tokens. For
information, see Activating and Deactivating STS in an AWS Region
in the IAM User Guide.
To view the current session token version, see the
GlobalEndpointTokenVersion
entry in the response of the
GetAccountSummary operation.