No payload in GOAWAY frame

I'm trying to send POST request to Apple Push Notifications server (APN). I'm getting GOAWAY frame without payload data, through APN manual states that it must contain a JSON data.

The code I'm using:

var logger = {
    fatal: noop,
    error: noop,
    warn : noop,
    info : noop,
    debug: function(data) {
        console.log(data);  //GOAWAY frame appears with no payload
    },
    trace: noop,
    child: function() { return this; }
};

var req = http2.request({
    hostname: 'api.push.apple.com',
    protocol: 'https:',
    port: 443,
    method: 'POST',
    path: '/3/device/' + deviceToken,
    agent: new http2.Agent({log: logger}),
    headers: {
        'Authorization': 'bearer ' + providerToken,
        'apns-topic': 'web.com.example'
    }
}, function(res) {
    console.log('done');
    res.pipe(process.stdout);
});
req.write(JSON.stringify(post));
req.end();

Should I do extra actions to get a payload?

Thank you very much for this module!