detect that GET or POST http request can be change to a POST or GET method request or not ($_REQUEST

POST test.php?id=1 HTTP/1.1

(nothing)

to

GET test.php?id=1 HTTP/1.1

for who want to save his data ( or --null-connection ?

and

GET test.php?id=1

to

POST test.php

id=1

for who want to use --chunk but he not sure the request can change to a POST request or not