@Muhammad-Saqib I wasn't suggesting that you specifically implement it, just that you should wait until someone does. If you can implement it, then please do!
Whoever it is, it's not us... as @pitaj suggests it could be bots issuing HEAD requests to determine site availability before crawling? Who knows... I am looking at some of them coming in our logging system now, but they have no user agent either, so 🤷