# File lib/rack/protection/json_csrf.rb, line 16
      def call(env)
        status, headers, body = app.call(env)
        if headers['Content-Type'].to_s.split(';', 2).first =~ /^\s*application\/json\s*$/
          result = react(env) if referrer(env) != Request.new(env).host
        end
        result or [status, headers, body]
      end