it looks at the referer field in the http request to see where you came from, and for the existence of a scarlet cookie. if it's a place they don't like, it dro

it looks at the referer field in the http request to see where you came from, and for the existence of a scarlet cookie. if it's a place they don't like, it drops a scarlet cookie in your browser that says they don't like you and then redirects. if the cookie exists, it redirects regardless.