Exclude URL with non-stanard port from Proxy via PAC/WPAD file

I'm running a Squid proxy and want to exclude a certain web address that is accessed over a non-standard port from going through the proxy, rather than open the port in an ACL within squid.conf (seems its a specific usage case).

In my case the port in question TCP 2222 (DirectAdmin) over both http:// and https://. I wasn't sure if this was actually possible to do without opening the port itself, but I did find several articles about bypassing URL's with non standard ports with PAC/WPAD. I've tried a ruleset like the one below, which sets a wildcard for the TLD and specific rules for the non-standard port URL.

 if (shExpMatch(host, "*.somedomain.com") ||
     shExpMatch(url, "http://example.somedomain.com:2222/*") ||
     shExpMatch(url, "https://example.somedomain.com:2222/*"))
     return "DIRECT";

Using pactester, I am getting the correct response of DIRECT from a rule test

pactester -p /path/to/wpad.dat -u http://example.somedomain.com
DIRECT
pactester -p /path/to/wpad.dat -u http://example.somedomain.com:2222
DIRECT
pactester -p /path/to/wpad.dat -u https://example.somedomain.com:2222
DIRECT

However it appears the request is still being sent through the proxy as I get "Proxy is refusing connections" etc in a web browser. The port itself is not blocked, I can telnet to it, but the Sqiud ACL doesn't have the port allowed. Though this is what I am trying to avoid doing, and surely the DIRECT response means bypass?

Is this actually possible to achieve with a PAC/WPAD with non-standard ports, or their an alternative way to bypass and send directly for this specific case?