https://bugs.php.net/bug.php?id=62596
PHP :: Bug #62596 :: getallheaders() missing with PHP-FPM
phpbugmissingfpm
https://www.php.net/manual/en/function.getallheaders.php
PHP: getallheaders - Manual
Fetch all HTTP request headers
phpmanual
https://mailman.nginx.org/pipermail/nginx-ru/2007-September/013470.html
getallheaders
https://www.php.net/manual/de/function.getallheaders.php
PHP: getallheaders - Manual
Liefert alle HTTP-Request-Header
phpmanual
https://bugs.php.net/bug.php?id=65917&edit=2
PHP :: Request #65917 :: getallheaders() is not supported by the built-in web server