I know this isn't the question you're asking, but...
How does knowing the origin AP where the request came from help you? What problem are you really trying to resolve? If the problem is stopping persistent requests, I'm not sure how knowing this information gets you where you need to be?
We need to know two things to give you a good suggestion.
1. What problem are you trying to fix?
2. What products are you using (we might then ask about config)? I.e. Instant APs, controllers? Do you have Clearpass?
Also note that (unless you've got a very specific setup), it's unlikely your APs are giving out IP addresses.
Thanks.