Callback-url-file-3a-2f-2f-2fproc-2fself-2fenviron File

The URL seemed nonsensical, but Emma's curiosity was piqued. She decided to investigate further. As she analyzed the URL, she realized it was referencing a file path on a Linux system.

Which translates to a file path on a Linux system: /proc/self/environ callback-url-file-3A-2F-2F-2Fproc-2Fself-2Fenviron

Emma's eyes widened as she decoded the URL. The /proc/self/environ path referred to a special file in Linux, which contained the environment variables of the current process. The URL seemed nonsensical, but Emma's curiosity was piqued