### Question:
AwsHostNameUtils { @Deprecated public static String parseServiceName(URI endpoint) { String host = endpoint.getHost(); if (!host.endsWith(".amazonaws.com")) { throw new IllegalArgumentException( "Cannot parse a service name from an unrecognized endpoint (" + host + ")."); } String serviceAndRegion = host.substring(0, host.indexOf(".amazonaws.com")); if (serviceAndRegion.endsWith(".s3") || S3_ENDPOINT_PATTERN.matcher(serviceAndRegion).matches()) { return "s3"; } char separator = '.'; if (serviceAndRegion.indexOf(separator) == -1) { return serviceAndRegion; } String service = serviceAndRegion.substring(0, serviceAndRegion.indexOf(separator)); return service; }  @Deprecated static String parseRegionName(URI endpoint); static String parseRegionName(final String host,
            final String serviceHint); @Deprecated static String parseServiceName(URI endpoint); static String localHostName();  }### Answer:
@Test public void testParseServiceName() { assertEquals("iam", AwsHostNameUtils.parseServiceName(IAM_ENDPOINT)); assertEquals("iam", AwsHostNameUtils.parseServiceName(IAM_REGION_ENDPOINT)); assertEquals("ec2", AwsHostNameUtils.parseServiceName(EC2_REGION_ENDPOINT)); assertEquals("s3", AwsHostNameUtils.parseServiceName(S3_ENDPOINT)); assertEquals("s3", AwsHostNameUtils.parseServiceName(S3_BUCKET_ENDPOINT)); assertEquals("s3", AwsHostNameUtils.parseServiceName(S3_REGION_ENDPOINT)); assertEquals("s3", AwsHostNameUtils.parseServiceName(S3_BUCKET_REGION_ENDPOINT)); }