[ErroraBorealis]

I'm not sure there's a way to do that, all you can do is not waste any more resources on it if it's spam, the point is to determine what is and is not spam.

I actually looked on Wikipedia for this, and most of the methods for blocking ddos involve hardware, what I'm proposing is closest to what wiki calls "Rate-based Intrusion Prevention System"

I think it'd be a good idea to have a server to filter traffic on it's own to make this effective, that's pretty much what cloudflare does.