in src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java [57:62]
public NeptuneRequestMetadataSigV4Signer(
final String regionName, final AWSCredentialsProvider awsCredentialsProvider)
throws NeptuneSigV4SignerException {
super(regionName, awsCredentialsProvider);
}