| Package | Description | 
|---|---|
| io.netty.handler.ssl.ocsp | Certificate validation using OCSP | 
| io.netty.resolver.dns | An alternative to Java's built-in domain name lookup mechanism that resolves a domain name asynchronously,
 which supports the queries of an arbitrary DNS record type as well. | 
| io.netty.resolver.dns.macos | MacOS specific nameserver resolution. | 
| Class and Description | 
|---|
| DnsNameResolver A DNS-based  InetNameResolver. | 
| Class and Description | 
|---|
| AuthoritativeDnsServerCache Cache which stores the nameservers that should be used to resolve a specific hostname. | 
| DefaultDnsServerAddressStreamProvider A  DnsServerAddressStreamProviderwhich will use predefined default DNS servers to use for DNS resolution. | 
| DnsAddressResolverGroup | 
| DnsCache A cache for DNS resolution entries. | 
| DnsCacheEntry Represents the results from a previous DNS query which can be cached. | 
| DnsCnameCache A cache for  CNAMEs. | 
| DnsNameResolver A DNS-based  InetNameResolver. | 
| DnsNameResolverBuilder A  DnsNameResolverbuilder. | 
| DnsNameResolverChannelStrategy Strategy that influence how  Channels are used during queries. | 
| DnsNameResolverException A  RuntimeExceptionraised whenDnsNameResolverfailed to perform a successful query. | 
| DnsQueryLifecycleObserver This interface provides visibility into individual DNS queries. | 
| DnsQueryLifecycleObserverFactory Used to generate new instances of  DnsQueryLifecycleObserver. | 
| DnsServerAddresses Provides an infinite sequence of DNS server addresses to  DnsNameResolver. | 
| DnsServerAddressStream An infinite stream of DNS server addresses. | 
| DnsServerAddressStreamProvider Provides an opportunity to override which  DnsServerAddressStreamis used to resolve a specific hostname. | 
| NoopAuthoritativeDnsServerCache A noop  AuthoritativeDnsServerCachethat actually never caches anything. | 
| NoopDnsCache A noop DNS cache that actually never caches anything. | 
| NoopDnsCnameCache | 
| NoopDnsQueryLifecycleObserverFactory | 
| Class and Description | 
|---|
| DnsServerAddressStream An infinite stream of DNS server addresses. | 
| DnsServerAddressStreamProvider Provides an opportunity to override which  DnsServerAddressStreamis used to resolve a specific hostname. | 
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