content-app always sets Content-Type header to 'application/octet-stream'
The FileResponse from aiohttp tries to guess the content type by looking at the extension of the filename. The content-app is always handing the FileResponse object an Artifact file that doesn't have an extension. As a result the Content-Type cannot be inferred.
We should manually mimetypes.guesstype0 function that aiohttp already uses for guessing the content type, but pass it the 'relative_path' from the content artifact. We can then use the values returned as parameters for FileResponse object.
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