text: const {HelloRequest, HelloReply} = require('./helloworld_pb.js');
  const {GreeterClient} = require('./helloworld_grpc_web_pb.js');
  
  var client = new GreeterClient('http://localhost:8080');
  
  var request = new HelloRequest();
  request.setName('World');
  
  client.sayHello(request, {}, (err, response) => {
    console.log(response.getMessage());
  });