public function getHeader($header)
{
if (!$this->hasHeader($header)) {
if (strtolower($header) === 'host' && ($this->uri && $this->uri->getHost())) {
return [$this->getHostFromUri()];
}
return [];
}
$header = $this->headerNames[strtolower($header)];
$value = $this->headers[$header];
$value = is_array($value) ? $value : [$value];
return $value;
}