Resolvers and resolver policies specify how a Zorp service should resolve the domain names in client requests; resolvers are used whenever Zorp needs to resolve domain names in order to perform connection processing. Such an event occurs when InbandRouter is used and the Zorp proxy has a DNS name to establish connection to. Names are usually resolved using the domain name server ( DNSResolver class), or the HashResolver class when the dependence on DNS has to be avoided.

To actually perform name resolution, you have to use a ResolverPolicy instance that contains a configured Resolver class. Resolver policies provide a way to re-use Resolver instances whithout having to define a Resolver for each service individually.