How do i open URL in background and get its json response in variable??

I want to open URL in background and then get its json content by calling a function when user clicked on a button?? how do i do this with the help of this plugin?? atleast give me some idea of how to get json content of the URL using this plugin??

I also tried to ask the same question on stackoverflow but no one have a answer for your plugin... that's why i asked here it may help others in future.

No file, test, or entry point is named. First clarify whether this plugin supports retrieving a URL's JSON response and identify the intended documented usage; done would be a clear, verified usage example or a documented limitation.

Written by the indexing model from the issue text.