@Override
    public String guessRegionFromEndpoint(String host, String serviceHint) {
        return EndpointToRegion.guessRegionNameForEndpoint(host, serviceHint);
    }
An implementation of {@link RegionFromEndpointResolver} that is supported by region metadata files.

@see EndpointToRegion#guessRegionNameForEndpoint(String, String)
aws-java-sdk-core/src/main/java/com/amazonaws/regions/MetadataSupportedRegionFromEndpointProvider.java