lib/sidekiq/prometheus/exporter.rb in sidekiq-prometheus-exporter-0.1.16 vs lib/sidekiq/prometheus/exporter.rb in sidekiq-prometheus-exporter-0.1.17

@@ -10,10 +10,10 @@
       REQUEST_VERB = 'GET'.freeze
       REQUEST_METHOD = 'REQUEST_METHOD'.freeze
       NOT_FOUND_TEXT = 'Not Found'.freeze
       MOUNT_PATH = '/metrics'.freeze
       # rubocop:disable Style/MutableConstant
-      HEADERS = {'Content-Type' => 'text/plain; version=0.0.4', 'Cache-Control' => 'no-cache'}
+      HEADERS = {Rack::CONTENT_TYPE => 'text/plain; version=0.0.4', Rack::CACHE_CONTROL => 'no-cache'}
       # rubocop:enable Style/MutableConstant
       EXPORTERS = Exporters.new
 
       class << self
         def banner