/**
* Determines whether two Request HTTP header sets are non-varying based on
* the vary response header value provided.
*
* @param string $vary A Response vary header
* @param array $env1 A Request HTTP header array
* @param array $env2 A Request HTTP header array
*
* @return Boolean true if the the two environments match, false otherwise
*/
public function requestsMatch($vary, $env1, $env2)
{
if (empty($vary)) {
return true;
}
foreach (preg_split('/[\\s,]+/', $vary) as $header) {
$key = HeaderBag::normalizeHeaderName($header);
$v1 = isset($env1[$key]) ? $env1[$key] : null;
$v2 = isset($env2[$key]) ? $env2[$key] : null;
if ($v1 !== $v2) {
return false;
}
}
return true;
}
