Client/HttpClient.php
public function get($uri)
    {
        $opts = $this->buildOpts('GET');
        if ($this->etag != null) {
            $opts['http']['header'] .= "\n" . sprintf('If-None-Match: "%s"', $this->etag);
        }
        return $this->execute($uri, $opts);
    }
public function get($uri)
    {
        $opts = $this->buildOpts('GET');
        if ($this->etag != null) {
            $opts['http']['header'] .= "\n" . sprintf('If-None-Match: "%s"', $this->etag);
        }
        return $this->execute($uri, $opts);
    }
{@inheritdoc}