However, if this refers to a Proxy Auto-Configuration (PAC) file designed for high-quality network routing (perhaps for a Flipper Zero device, or specialized firmware/network security configuration), here is a generalized write-up on how to structure a high-quality PAC file. High-Quality PAC File Structure Write-Up
The "High Quality" aspect ensures reliability. The PAC file defines a list of proxy servers rather than a single point of failure. e1207y pac file high quality
To understand the role of a high-quality PAC file Samsung GT-E1207Y However, if this refers to a Proxy Auto-Configuration