[Vala] Soup message.response_body.data is null

["Luis L. Rodríguez Oro" <luisr uci cu>]

Hello devs, Please help me.

I have this code to get a json text from a server, when I put the url in 
the web browser I get the Json OK. But in this code I get NULL at 
response_body.data and length = 0.

Please what I do wrong????

// valac --pkg libsoup-2.4
using Soup;
void main () {

    var session = new Soup.SessionAsync ();
    var message = new Soup.Message ("GET", 
"http://localhost:5800/get_json_list";);

    session.send_message (message);
    message.response_headers.foreach ((name, val) => {
        stdout.printf ("Name: %s -> Value: %s\n", name, val);
    });

    stdout.printf ("Message length: %lld\n%s\n",
                   message.response_body.length,
                   message.response_body.data);
}

********server code:
// valac --pkg libsoup-2.4 --thread
public class http_server {
    private Soup.Server server;
    private string      server_name;
    private int         server_port;

    public http_server(string n = "localhost", int p = 5800, string 
shared = "/tmp", string theme = "default"){
        this.server_port = p;
        this.server_name = n;

        try{
            this.server = new Soup.Server (Soup.SERVER_PORT, 
this.server_port);
            server.add_handler ("/", default_handler);

            string server_full_url = "http://"; + this.server_name + ":" 
+ this.server_port.to_string() + "/";
            print("Iniciando servidor-> %s\n",server_full_url);

            this.server.run ();
        }catch (Error e) {
            warning ("Error %s\n", e.message);
        }
    }

    public void default_handler (Soup.Server server, Soup.Message msg, 
string path,
                                 GLib.HashTable? query, 
Soup.ClientContext client){

        string response_text = """{
"pepe" : 35,
"parents": ["f" : "maria", "m" : "pepe"]
}""";

        msg.set_response ("application/json", Soup.MemoryUse.COPY, 
response_text.data);
    }
}

void main(){
    var a = new http_server();

    new MainLoop ().run ();
}

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