REST API Debug: Page Not Found situation

Hi developers. Just want to share with you a finding that might save you a few important minutes of your developer life with InterSystems IRIS.

But!

It should work; you deployed the REST API correctly, and everything is just in place.

What can go wrong?

The issue in my case was that I misspelled the name of the class, like in this picture:

It was a typo there. And there were no compilation errors, no console messages - no evidence of what is wrong. 

So, if you face a similar problem - Not Found message for a page that "just should work" - take a look at the Dispatch class? if the name is accurate?

And of course ask the community. Maybe it will save you a few important minutes of our precious developers' life.

Cheers!