Unable to access External API's

When i m calling api’s nothing came out i did’nt know whether its bcoz of routes or any other issue i have used restivus plugin and using angular js in client side but my default background page is Loading whenever i hit any api’s

You’re going to need to share some code before anyone can help…

var Api = new Restivus({
useDefaultAuth: false,
prettyJson: true,
enableCors: true,


return ticket.find({}).fetch();

I have Client side route also…