POST requests in gjs

post.js

const Lang = imports.lang;                       
const Soup = imports.gi.Soup;

let _session = new Soup.SessionAsync();         

function POST(url, params, callback) {
    let request = Soup.Message.new('POST', url);
    let _params = Soup.form_encode_hash(params);

    request.set_request('application/x-www-form-urlencoded',
                    Soup.MemoryUse.COPY,
                    _params,
                    _params.length);

    _session.queue_message(request, Lang.bind(this, 
                                             function(session, message) {                                                            callback(message.status_code, request.response_body.data);
                                             }
                         )
        );
} 

// Standalone script only section
const Mainloop = imports.mainloop;
POST('http://example.org/create', {'foo': 'bar'}, function(code, data) { log('post done'); log(code); log(data); Mainloop.quit(true); });
Mainloop.run(true);