In web technologies, the best way to interact with any web service is through Ajax requests. As Ionic Framework is a Hybrid Mobile framework based on web technologies, it utilizes the power of Ajax to wire up Ionic Apps with any web services.
$http is an in-built Angular service that is used as an abstraction for native JavaScript Ajax calls. The $http service has some high-level methods exposed to make HTTP requests using different HTTP methods such as POST, GET, PUT, and so on.
There are different signatures for different methods, but the response for all the methods is exactly the same. All the methods in the $http service are based on the promise objects, which help in registering success and error callbacks that receive data at a later point in time as these requests are asynchronous in nature.
The two most important methods are .get and .post whose usage is as follows:
$http.get('/api/url/resource')
.then(function(response){
// this is success callback
},function(errorResponse...