All over the internet I see example of how to set up dhcpd with WAPD proxy auto configuration using DHCP.
In the /etc/dhcpd.conf file
There are statements like this.
option wpad code 252;
option wpad code 252 = text;
What is code 252, where is it defined and what does it mean. Why is it a number 252 and not a useful statement like wpad-proxy-url; Why use 252 and not some other number (0, 5000). I get that it works, it just does not make any sense to a human (me). Googling for what is option 252 has been fruitless.