« URL structure & normalization
Case sensitivity
This page is registered at exactly /scraping/url-structure/CaseSensitive, mixed case. HTTP paths are case-sensitive by spec, and this server enforces that: only the exact casing above resolves.
A link elsewhere on the site pointing at this page with the wrong casing (say, /scraping/url-structure/casesensitive, all lowercase) doesn't get silently normalized. It 404s, as a genuinely different, nonexistent resource. Try that link: it's a real 404, not a redirect.