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Feature flags can become surprisingly complicated when an application shows different functionality to users based on their country or other conditions. I decided to buy ipv6 proxy https://spaceproxy.net/en/proxy-ipv6/ and test regional feature configurations before enabling a new release. This allowed me to verify that the correct version of a feature appeared in the expected locations and that users outside the target group were not accidentally affected. I also checked redirects and API responses because a frontend flag can sometimes interact with backend logic in unexpected ways. After adding these checks to the QA routine, releasing region-specific functionality became much less stressful.