Added support for PHP FPM on PATCH/DELETE/PUT requests.

[UDilhan]

Hi, on PHP FPM (in my case PHP FPM 7.4), the getallheaders() function returns an array with other keys than on PHP for Apache. This causes the PUT, DELETE, or PATCH requests are not recognized and the request is processed like a POST request. This patch will keep the servers without the getallheaders() function to work.