RESTEasy client framework authentication credentials

Question

I looked for the ways, how a client can send authentication credentials to a webservice (e.g. Tomcat Manager) and found this topic

http://stackoverflow.com/questions/1885844/resteasy-client-framework-authentication-credentials

Just have some questions after reading: 1. Are there other possibilities to do that? 2. What imports are needed? I have choise between import org.apache.commons.httpclient.* and org.apache.http.auth.*

Thanks in advance.

Mur