After lurking here for a bit I see that k12 sysadmins know their way around Chrome policies ;).

TL;DR: how do I URL White list jnlp for a specific website? "jnlp://example.com/" doesn't work.

There is a Java app a client uses that is launched via Chrome and asks to open a jnlp extension (it's not a download - its a prompt to open or close). The issue is that users need to click "Open xyz app" every time.

If I use this URL Whitelist policy (via GPO) and put in there "jnlp://*" there is no prompt. However, this means that it covers the whole Internet - not good. So I try to limit it to "jnlp://example.com/" as per this schema, however it does not work. The website is http://www.example.com/something/something.html and it launches a JNLP that point to wwwap.example.com:7777. I have tried adding "jnlp://www.example.com/", "jnlp://example.com", ""jnlp://*.example.com/" (this one is not supposed to be valid) as well as the wwwap subdomain with no luck.