Forget stack traces. I've met multiple "web developers" (actually working on the backend or "full-stack", building API servers and whatnot) who came complainin

Forget stack traces. I've met multiple "web developers" (actually working on the backend or "full-stack", building API servers and whatnot) who came complaining about this or that server being "unreachable" and could I check it's up / whether the firewall allows them through. Only to find they were getting HTTP 404 errors or the like. Which were explicit in the errors they'd show me.