added "ad_conn bot_p" to check, whether request was initiated by a bot
This feature is based on a simple heuristic based on the user-agent (which can be certainly extended). It is useful to avoid e.g. Google bot to run into "notifications subscribe" + login attempts, which are useful for not-logged-in user, but not for bots. These attemps lead to failures in google statistics that might reduce the google ranking of a web site.
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