RuntimeError: redirection forbidden facebook image not creating in rails?

RuntimeError: redirection forbidden facebook image not creating in rails ?

1)gem 'open_uri_redirections'
2)models
private

def process_uri(uri)
    require 'open-uri'
    require 'open_uri_redirections'
    open(uri, :allow_redirections => :safe) do |r|
      r.base_uri.to_s
    end
end
3)if auth.info.image.present?
   avatar_url = process_uri(auth.info.image)
   user.update_attribute(:avatar, URI.parse(avatar_url))
end

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