How to handle If Data returning from $http.get() is not in JSON format, Its a normal Text?

The .success and .error methods have been removed from AngularJS 1.6.

Instead of

$http.get(...)
  .success(function(data, ...) {
    ...
  })
  .error(function(data, ...) {
    ...
  });

use

$http.get(...).then(
  function success(response) {
    var data = response.data;
    ...   
},function error(response) {
    var data = response.data;
});

Override the default response transformation of JSON.parse

If the Content-Type is application/json or the response looks like JSON, The $http service will deserialize it using a JSON parser.

To avoid that, configure the transformResponse property to pass the response without any transformation:

var config = { transformResponse: angular.identity };

$http.get(url, config).then(function(response) {
    console.log(response.data);
});

For more information, see AngularJS $http Service - Overriding the Default Transformations Per Request

Json is the default, you can set the expected reponse type to text:

$http.get('http:...', {responseType: "text"}).success(function(reponse) {
    console.log(reponse);
});

More info can found in AngularJS docs