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"Detecting the use of "curl | bash" server side" (as opposed to curl & save to a file).
Now this is some very clever, and scary, stuff. It's possible to detect if a #HTTPS request is being piped directly into #bash or just saved to a file. You can use this to send a different file (& commands!) only when it's going straight into bash.

https://www.idontplaydarts.com/2016/04/detecting-curl-pipe-bash-server-side/