Auto detect content type and send the type as a MediaType object.

[reev-create]

Something like this below contentType: MediaType.parse(mime(file.path)!)

Hey, it would be great if I could also contribute to this repo.

[apstanisic]

I am not sure where this should be used?

Sure, find any issue with one of these labels: bug, enhancement, good first issue, and create PR