Steps to reproduce:

1. Create script item with the default timeout (3s) and the following script:

var result = '',
    request = new HttpRequest();

while (true) {
    result += request.get('https://deelay.me/2000/https://assets.zabbix.com/img/favicon.ico');
}

return result; 

1. Reload the configuration cache and use the Execute Now button to retrieve the value.
2. Observe that item is not receiving data and is not receiving the timeout error for a long time (much longer than the defined timeout).

Expected:
It is expected that timeout specified would be tolerated better and the item would not stay in this "hanged" state for a long period of time.