in src/main/java/com/amazonaws/neptune/auth/NeptuneNettyHttpSigV4Signer.java [94:98]
public NeptuneNettyHttpSigV4Signer(final String regionName,
final AwsCredentialsProvider awsCredentialsProvider,
final String serviceName) throws NeptuneSigV4SignerException {
super(regionName, awsCredentialsProvider, serviceName);
}