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https://blog.it-kb.ru/2014/06/27/forward-proxy-squid-3-3-on-ubuntu-server-14-04-lts-part-6-configure-proxy-auto-configuration-via-web-proxy-automatic-discovery-on-apache-2-and-parsing-wpad/
Настройка прокси сервера Squid 3.3 на Ubuntu Server 14.04 LTS. Часть 6. Настройка Proxy Auto Configuration (WPAD)