Ну установите прокси на http клиент
Отправьте get запрос на http://ip.bablosoft.com/
Получить содержание ответа да и все на этом
Failed to get proxy IP
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What's with all these errors in 28.9.3

Getting tons of these errors on all sorts of proxies (mobile/ residential) from different providers.
The same proxies work very well in normal browsers, antidetect browsers, even in automation tools like the BAS competitor that we all knowLE: When the proxy is set, the HTTP sniffer gives these errors:

