Save last HTTP payload sended

i have configured my arduino as access point and i have a form in my html code. my arduino code is waiting for inputs fields to be submitted to execute some functions ...
well, what i want to do is that when i re-run arduino card, i want the last payload sended it from web page to arduino be saved.
i don't need to re-submit inputs values for every time arduino shuts down.
i hope my explination is clear..
is it a possible thing to save values in arduino program ???
is there any possible way to do that?

SD card