public static AmazonRoute53ResolverAsyncClientBuilder asyncBuilder() {
        return AmazonRoute53ResolverAsyncClientBuilder.standard();
    }
Client for accessing Route53Resolver asynchronously. Each asynchronous method will return a Java Future object
representing the asynchronous operation; overloads which accept an {@code AsyncHandler} can be used to receive
notification when an asynchronous operation completes.
<p>
<p>
When you create a VPC using Amazon VPC, you automatically get DNS resolution within the VPC from Route 53 Resolver.
By default, Resolver answers DNS queries for VPC domain names such as domain names for EC2 instances or Elastic Load
Balancing load balancers. Resolver performs recursive lookups against public name servers for all other domain names.
</p>
<p>
You can also configure DNS resolution between your VPC and your network over a Direct Connect or VPN connection:
</p>
<p>
<b>Forward DNS queries from resolvers on your network to Route 53 Resolver</b>
</p>
<p>
DNS resolvers on your network can forward DNS queries to Resolver in a specified VPC. This allows your DNS resolvers
to easily resolve domain names for Amazon Web Services resources such as EC2 instances or records in a Route 53
private hosted zone. For more information, see <a href=
"https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resolver.html#resolver-overview-forward-network-to-vpc"
>How DNS Resolvers on Your Network Forward DNS Queries to Route 53 Resolver</a> in the <i>Amazon Route 53 Developer
Guide</i>.
</p>
<p>
<b>Conditionally forward queries from a VPC to resolvers on your network</b>
</p>
<p>
You can configure Resolver to forward queries that it receives from EC2 instances in your VPCs to DNS resolvers on
your network. To forward selected queries, you create Resolver rules that specify the domain names for the DNS
queries that you want to forward (such as example.com), and the IP addresses of the DNS resolvers on your network
that you want to forward the queries to. If a query matches multiple rules (example.com, acme.example.com), Resolver
chooses the rule with the most specific match (acme.example.com) and forwards the query to the IP addresses that you
specified in that rule. For more information, see <a href=
"https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/resolver.html#resolver-overview-forward-vpc-to-network"
>How Route 53 Resolver Forwards DNS Queries from Your VPCs to Your Network</a> in the <i>Amazon Route 53 Developer
Guide</i>.
</p>
<p>
Like Amazon VPC, Resolver is Regional. In each Region where you have VPCs, you can choose whether to forward queries
from your VPCs to your network (outbound queries), from your network to your VPCs (inbound queries), or both.
</p>
aws-java-sdk-route53resolver/src/main/java/com/amazonaws/services/route53resolver/AmazonRoute53ResolverAsyncClient.java