samplegcpfunction.java

import com.google.cloud.functions.HttpFunction;
import com.google.cloud.functions.HttpRequest;
import com.google.cloud.functions.HttpResponse;

public class HelloHttp implements HttpFunction {

    @Override
    public void service(HttpRequest request, HttpResponse response) throws IOException {
        final BufferedWriter writer = response.getWriter();
        response.setContentType("application/html");
        writer.write("Hello World");
    }
}