in src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java [99:103]
public NeptuneRequestMetadataSigV4Signer(final String regionName,
final AwsCredentialsProvider awsCredentialsProvider,
final String serviceName) throws NeptuneSigV4SignerException {
super(regionName, awsCredentialsProvider, serviceName);
}