Probably similar to Dancer-1.x, see Re^2: Dancer as a proxy, it says 
get '/stream_example' => sub {
    return send_file(
        \'fake contents to be replaced in override',
        streaming => 1,
        callbacks => {
            override => sub {...

[download]

In reply to Re: Write a Filehandle w/Dancer2 by Anonymous Monk
in thread Write a Filehandle w/Dancer2 by hardburn

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