This is an advanced technical feature, primarily for developers at this time.
What if you want to hook your Radio3 flow into a service that we don't have built-in support for? You can always use the RSS feed to make the connection, but then you have to poll the feed to see when it updates. That seems inefficient.
So there's a new feature in 0.53 that allows you to specify the URL of a service that we will ping whenever the RSS feed updates. It sends along one parameter, the URL of the feed.
There's a new Advanced settings panel where you can enter this URL.
Please don't post comments about this feature on the main mail list, if you have questions post a comment here. If there's enough interest we'll start a Radio3 developers list.
The URL you provide must be of the form:
In other words, all we do before calling it is add the URL of the user's feed to the end of the string you provide. If you don't include the ?url= (or whatever you call the param) then it won't work.