The direct answer
A page can display a not-found message while returning a successful response. That mismatch makes missing content harder to distinguish from a valid page.
A practical check
Test a deliberately invalid URL and inspect both the response status and visible content. Check whether the same generic shell is returned for every unknown path.
Choosing the next step
Configure meaningful not-found handling in the hosting and routing layers. Verify a valid page afterward so the fix does not turn legitimate deep links into errors.
Further reading
Platform guidance can change. Consult the current official documentation before making platform-specific changes.
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