dragonfly filename fix

module Dragonfly
  module Endpoint
    def success_headers(job)
      {
        "Content-Type" => job.app.resolve_mime_type(job.result),
        "Content-Length" => job.size.to_s,
        "Content-Disposition" => "filename=#{job.name}"        
      }.merge(cache_headers(job))
    end

  end
end