.then is not a function in angularjs

In this article, We will discuss then is not a function in angularjs. 

I will explain you how to use the .then function in the best way by example which is as follows:-

Example:-
$http({
            method: "POST",
            url: "User/Test"            
        }).then(function onSuccess(response) {            
              // your code  if any
        }).catch(function onError(response) {
            alert("Error");
        });