in src/main/java/com/amazonaws/neptune/auth/NeptuneApacheHttpSigV4Signer.java [66:71]
public NeptuneApacheHttpSigV4Signer(final String regionName,
final AWSCredentialsProvider v1AwsCredentialProvider)
throws NeptuneSigV4SignerException {
super(regionName, v1AwsCredentialProvider);
}