Content length of a response in treq

Hi,
I am trying to use treq for a project in which I am also going to generate
a progress bar for the downloading session. But the problem I am facing is
that I can't find a way to get the content length header from the response.

The "response.length"  gives me "unknown size".So I there a way I can get
the length for all types of content?

Thanks

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