pac-proxy is a utility to run a local HTTP(s) proxy server which directs traffic based on a proxy autoconfig (PAC) file.
Some large companies may be using very complicated rules for web proxy access in PAC files and therefore it may be very
complex to properly set HTTP_PROXY and HTTPS_PROXY variables. The intent of this utility is to enable simple configuration by running this proxy
on the local machine and using localhost as the HTTP proxy.