ycb_django_pr16642

what a new run launched now would send

Improper guessing of Mime Type for "br" and "Z" file types
Description
	
Below FileResponse will set the content type as text/html, even if the last file extension is "Z' or "br".
FileResponse(open('test.html.Z', 'rb'))
FileResponse(open('test.html.br', 'rb'))

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

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they are collected automatically.

Stay on this snapshot checkout (`task/ycb_django_pr16642`). Never checkout, pull, or rebase onto `main`. That branch is a README-only orphan.
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Some past runs of this task were launched with a different prompt (the prompt template changed since, or those runs predate this benchmark's stored prompt). Each run persists the exact prompt it sent at launch — that per-launch record is the audit trail; this page shows only the current one.