> +
> + @Override
> + public String service() {
> + return service;
> + }
> +
> + @Override
> + public String region(String host) {
> + return AwsHostNameUtils.parseRegionName(host, service());
> + }
> + }
> + }
> +
> + private final SignatureWire signatureWire;
> + private final String headerTag;
> + // private final String apiVersion;
copy from ```org.jclouds.aws.filters.FormSignerV4```
current, s3 api havn't any api version parameters, it's use in ec2 or other aws
api...
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