module ActionController module Head # Returns a response that has no content (merely headers). The options # argument is interpreted to be a hash of header names and values. # This allows you to easily return a response that consists only of # significant headers: # # head :created, location: person_path(@person) # # head :created, location: @person # # It can also be used to return exceptional conditions: # # return head(:method_not_allowed) unless request.post? # return head(:bad_request) unless valid_request? # render # # See Rack::Utils::SYMBOL_TO_STATUS_CODE for a full list of valid +status+ symbols. def head(status, options = {}) if status.is_a?(Hash) raise ArgumentError, "#{status.inspect} is not a valid value for `status`." end status ||= :ok location = options.delete(:location) content_type = options.delete(:content_type) options.each do |key, value| headers[key.to_s.dasherize.split("-").each { |v| v[0] = v[0].chr.upcase }.join("-")] = value.to_s end self.status = status self.location = url_for(location) if location self.response_body = "" if include_content?(response_code) self.content_type = content_type || (Mime[formats.first] if formats) response.charset = false end true end private def include_content?(status) case status when 100..199 false when 204, 205, 304 false else true end end end end