src/Neutrino/HttpClient/Contract/Streaming/Streamize.php
public function on($event, $callback)
    {
        $this->checkEvent($event);

        $this->getEventsManager()->attach($event, $callback);

        return $this;
    }
public function on($event, $callback)
    {
        $this->checkEvent($event);

        $this->getEventsManager()->attach($event, $callback);

        return $this;
    }
@param string $event
@param \Closure $callback

@return $this