A web server log with dozens of identical requests coming in at the exact same time. The log entries are for a file called “/robots.txt” and from a User-Agent called “AppleNewsBot”. A glowing Apple logo can be seen through the log file.

Attack of the AppleNewsBot

A bug in the Apple News crawler caused it to get stuck in a loop sending 100+ requests/second to websites with HTTPS certificates issued by Let’s Encrypt.