Add a description, image, and links to the callback-url topic page so that developers can more easily learn about it.

In this tutorial, you'll learn a step-by-step process you can use to create a multisite URL Inspection monitoring system. On January 31, Google released the URL Inspection API, enabling you to ...

I am trying to get my head around URL callbacks in R. I can send a call to the server's URL using httr::content(GET(..)) In my call I need to give my callback url and then listen for a response back.