diff --git a/app/controllers/ru_captcha/captcha_controller.rb b/app/controllers/ru_captcha/captcha_controller.rb
index a77ecea..591e027 100644
--- a/app/controllers/ru_captcha/captcha_controller.rb
+++ b/app/controllers/ru_captcha/captcha_controller.rb
@@ -1,6 +1,7 @@
 module RuCaptcha
   class CaptchaController < ActionController::Base
     def index
+      return head :ok if request.head?
       headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
       headers['Pragma'] = 'no-cache'
       data = generate_rucaptcha