Register user with android bug

Hi,

I’m facing a issue while i am trying to create a register form for android user what the problem is the first time user create none through this

example.com/api/get_nonce/?controller=user&method=register

and some how user not able to create take example because user already exist. then when user again try to create a user the above url not create a new nonce and show same old nonce i am not sure why its save cache or cookies for that nonce but its not changing.

because of that new registration url send 404 header and HttpURLConnection can’t read json data even there is a error written in registration url. please help me to fix it.

or provide a code for destroy a cookies which check wordpress nonce.

thank you
somendra meena