Hi Steven
We performed some internal tests to query a Basic Auth URL and you are correct that it doesn't work with that format anymore. The current release also supports POST and GET methods only.
I have discussed with our team and we will enhance the Custom Rule by supporting new fields in the next release v15.9 and support the PUT and DELETE methods as well. The next release is due out early next week.
The new fields will look like this:
<webRequest>
<url></url>
<username></username>
<password></password>
<domain></domain>
<method></method>
<postString></postString>
<timeout></timeout>
</webRequest>
Thank you for your patience.