AbstractDelegateHttpsURLConnection HTTPS URL connection support. 
DefaultHostnameVerifier HostnameVerifier provides a callback mechanism so that implementers of this interface can supply a policy for handling the case where the host to connect to and the server name from the certificate mismatch. 
DelegateHttpsURLConnection This class was introduced to provide an additional level of abstraction between and objects. 
Handler open an http input stream given a URL  
HttpsURLConnectionImpl A class to represent an HTTP connection to a remote object.