public function testGetAll()
{
$_SERVER['HTTP_HOST'] = "localhost";
$headers = new Headers();
$this->assertSame(['Host' => 'localhost'], $headers->getAll());
}
/**
* Get a value from HTTP Headers
* If key doesn't not exist, $value will be returned and assigned under that key.
*
* @param string $key Key for which you wish to get the value.
* @param mixed $value Default value that will be returned if $key doesn't exist.
*
* @return mixed Value of the given $key.
*/
public function header($key = null, $value = null)
{
return $this->isNull($key) ? $this->headers->getAll() : $this->headers->get($key, $value);
}