private function getAllHeaders()
{
$headers = [];
foreach ($_SERVER as $name => $value) {
if (substr($name, 0, 5) == 'HTTP_') {
$name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
$headers[$name] = $value;
} else {
if ($name == "CONTENT_TYPE") {
$headers["Content-Type"] = $value;
} else {
if ($name == "CONTENT_LENGTH") {
$headers["Content-Length"] = $value;
}
}
}
}
return $headers;
}