[https://rawsec.ml/en/picoCTF-2018-write-up/#400-fancy-alive-monitoring-web](https://rawsec.ml/en/picoCTF-2018-write-up/#400-fancy-alive-monitoring-web)

Original writeup (https://rawsec.ml/en/picoCTF-2018-write-up/#400-fancy-alive-monitoring-web).