Ruby on Rails

My production asset_host config looks like this:

config.action_controller.asset_host = Proc.new { |source, request|
if request.ssl?
"#{request.protocol}#{request.host_with_port}"
else
"#{request.protocol}assets#{(source.length % 4) +
1}.example.com"
end
}

...which is more or less straight from the docs:
http://api.rubyonrails.org/classes/ActionView/Helpers/AssetTagHelper.html

When I go to assets:precompile, I get this:

$ RAILS_ENV=production bundle exec rake assets:precompile
rake aborted!
This asset host cannot be computed without a request in scope. Remove
the second argument to your asset_host Proc if you do not need the
request.

....except that I can't really remove the 2nd arg because I need to
know if the request is ssl or not. That said, I understand that a
request isn't present during the rake task to generate the assets....

So how do I get out of this catch 22?

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