public function setSslCertificate($sslCertificate = '')
{
if (!is_string($sslCertificate) || trim($sslCertificate) != '' && !is_readable($sslCertificate)) {
throw new InvalidArgumentException('Parâmetro inválido.');
}
if ($sslCertificate != '') {
$this->httpClient->setSslVerification($sslCertificate, true, 2);
} else {
$this->httpClient->setSslVerification(false);
}
return $this;
}