As you can see, streaming with send_file is possible for a while now.

On Wed, Oct 17, 2012 at 4:24 AM, Maurice Mengel <mauricemengel@gmail.com> wrote:
I guess you don't want to split it your response into pages (50 hits
or so per page), you seem to want to stream a file to your users
(without writing it to server hard disk). I looked into that a long
while ago, got it to work in a test, but never used it in production.

It's mentioned http://search.cpan.org/~xsawyerx/Dancer-1.3110/lib/Dancer.pm#send_file.
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