rucaptcha/app/controllers/ru_captcha/captcha_controller.rb

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module RuCaptcha
class CaptchaController < ActionController::Base
def index
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return head :ok if request.head?
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headers['Cache-Control'] = 'no-cache, no-store, max-age=0, must-revalidate'
headers['Pragma'] = 'no-cache'
data = generate_rucaptcha
opts = { disposition: 'inline', type: 'image/gif' }
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send_data data, opts
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end
end
end