Context:
https://en.wikipedia.org/wiki/Anubis_(software)
Anubis is an open source software program that adds a proof of work challenge to websites before users can access them in order to deter web scraping. It has been adopted mainly by Git forges and free and open-source software projects.[4][5]
Iocaine is a defense mechanism against unwanted scrapers, sitting between upstream resources and the fronting reverse proxy.