Well. What I find odd about it is that if there is reference to localhost then a production page is reaching out to clients computers to parse some math formula. I think the developer hardcoded something that worked for him and pushed to prod. It could possibly still work for him but not for others without a program listening on that port.
How can you distinguish between "legitimate marketing" and some phishing email that looks like marketing material with a tracked unsubscribe link? Clicking on that unsubscribe link just lets them know email is active and its value has just been increased
Hold up. Dont change stuff in /usr/lib/. That directory contains default settings that comes with packages. If you need to overwrite those settings use /etc for that.
Number 4 hit home for me. I've been just trying random shit until it compiles. When it compiles it usually works without understanding what the fuck is going on
Drinking red wine