chubbyphp / chubbyphp-static-file / 29865200185

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Prevent MIME sniffing: default Content-Type, always send nosniff (Fable 5)

If the extension was unknown, no Content-Type header was sent at all and
there was no X-Content-Type-Options: nosniff. Browsers would then sniff
the body - if the served directory can contain attacker-influenced files
(uploads, generated content), an HTML/JS payload with an unknown
extension executes on the origin.

Fix: default to application/octet-stream and always send
X-Content-Type-Options: nosniff on every response (200, 304, HEAD).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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