[Twisted-web] How to get Content-Type when I upload a picture?

[水鏡]

Dears,

I used twisted to develop my web site just a little time.
I have a question about how to get Content-Type when I upload a picture?
When I get request.args["picture"], I only get picture content strings.
Can I have a easy way to get the picture's Content-Type?

-- 

Best regards,
Eric Chen
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