The following example shows how this may be done:

 SSLContext sslContext = SSLContext.getInstance (....);
 HttpsServer server = HttpsServer.create();

 server.setHttpsConfigurator (new HttpsConfigurator(sslContext) {
     public void configure (HttpsParameters params) {

         // get the remote address if needed
         InetSocketAddress remote = params.getClientAddress();

         SSLContext c = getSSLContext();

         // get the default parameters
         SSLParameters sslparams = c.getDefaultSSLParameters();
         if (remote.equals (...) ) {
             // modify the default set for client x
         }

         params.setSSLParameters(sslparams);
     }
 });