Rails 3: button_to using https

I want to link to a route using the https protocol.

I'm trying:

  <%= button_to '', carts_p开发者_如何学Cath(:service_id => @service),:only_path => false, :protocol => 'https://', :class => "buy-btn"%>

But it still goes to http://...

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Already answered it seems, try this: link_to with :protocol isn't working