in src/main/java/software/amazon/msk/auth/iam/internals/MSKCredentialProvider.java [288:301]
public URI buildEndpointConfiguration(Region stsRegion) {
StsEndpointParams params = StsEndpointParams.builder()
.region(stsRegion)
.build();
try {
return StsEndpointProvider.defaultProvider()
.resolveEndpoint(params)
.get()
.url();
} catch (InterruptedException | ExecutionException e) {
throw new RuntimeException(e);
}
}