lib/responders_backport/responder.rb
def api_behavior(error)
      if get?
        display resource
      elsif has_errors?
        display resource.errors, :status => :unprocessable_entity
      elsif post?
        display resource, :status => :created, :location => resource_location
      else
        head :ok
      end
    end
def api_behavior(error)
      if get?
        display resource
      elsif has_errors?
        display resource.errors, :status => :unprocessable_entity
      elsif post?
        display resource, :status => :created, :location => resource_location
      else
        head :ok
      end
    end
This is the common behavior for "API" requests, like :xml and :json.