src/HTTP/Request2/Observer/Log.php
public function update(SplSubject $subject)
    {
        $event = $subject->getLastEvent();
        if (!in_array($event['name'], $this->events)) {
            return;
        }

        switch ($event['name']) {
        case 'connect':
            $this->log('* Connected to ' . $event['data']);
            break;
        case 'sentHeaders':
            $headers = explode("\r\n", $event['data']);
            array_pop($headers);
            foreach ($headers as $header) {
                $this->log('> ' . $header);
            }
            break;
        case 'sentBody':
            $this->log('> ' . $event['data'] . ' byte(s) sent');
            break;
        case 'receivedHeaders':
            $this->log(sprintf(
                '< HTTP/%s %s %s', $event['data']->getVersion(),
                $event['data']->getStatus(), $event['data']->getReasonPhrase()
            ));
            $headers = $event['data']->getHeader();
            foreach ($headers as $key => $val) {
                $this->log('< ' . $key . ': ' . $val);
            }
            $this->log('< ');
            break;
        case 'receivedBody':
            $this->log($event['data']->getBody());
            break;
        case 'disconnect':
            $this->log('* Disconnected');
            break;
        }
    }
public function update(SplSubject $subject)
    {
        $event = $subject->getLastEvent();
        if (!in_array($event['name'], $this->events)) {
            return;
        }

        switch ($event['name']) {
        case 'connect':
            $this->log('* Connected to ' . $event['data']);
            break;
        case 'sentHeaders':
            $headers = explode("\r\n", $event['data']);
            array_pop($headers);
            foreach ($headers as $header) {
                $this->log('> ' . $header);
            }
            break;
        case 'sentBody':
            $this->log('> ' . $event['data'] . ' byte(s) sent');
            break;
        case 'receivedHeaders':
            $this->log(sprintf(
                '< HTTP/%s %s %s', $event['data']->getVersion(),
                $event['data']->getStatus(), $event['data']->getReasonPhrase()
            ));
            $headers = $event['data']->getHeader();
            foreach ($headers as $key => $val) {
                $this->log('< ' . $key . ': ' . $val);
            }
            $this->log('< ');
            break;
        case 'receivedBody':
            $this->log($event['data']->getBody());
            break;
        case 'disconnect':
            $this->log('* Disconnected');
            break;
        }
    }
Called when the request notifies us of an event.

@param HTTP_Request2 $subject The HTTP_Request2 instance

@return void