var jayson = require(__dirname + '/../..');
  
  // create a client
  var client = jayson.client.http({
    port: 3000,
    hostname: 'localhost'
  });
  
  // invoke "add_2"
  client.request('add_2', [3], function(err, error, response) {
    if(err) throw err;
    console.log(response); // 5!
  });