Load my Custom Google API from Javascript Library (remote projects)

Question

I'm trying to load my custom Google Api (Appengine Endpoints) to my frontend project but I receive TypeError: gapi.client.myCustomApi is undefined .

I have two projects in Appengine (Frontend and backend project). I have generated the Api Key from the Backend Project . So, I'm following this tutorial: https://cloud.google.com/appengine/docs/python/endpoints/consume_js

This is my index.html in code in Frontend project:

<script>
function loadGapi(){
gapi.client.setApiKey('AIzaSyBvg9bSWGUHhAO-TPIww3KuKhJqC2_BAFk');
gapi.client.load('myCustomApi', 'v1', function() {
    gapi.client.myCustomApi.list().execute(function(resp) {
        console.log(resp);
    });
}, 'https://my-backend-project.appspot.com/_ah/api');
}
 </script>

<script src="https://apis.google.com/js/client.js?onload=loadGapi"> </script>

Please reply if anyone can help me. Thanks!

EDIT1:

I have used gapi.client.request for testing, and it works perfect. gapi.client.load doesn't work yet.

gapi.client.request({
   "path": "/myCustomApi/v1.0/list",
   "root": "https://my-backend-project.appspot.com/_ah/api"
}).execute(function (response) { 
console.log(response); 
});

Answer 1

I have fixed it! Was my mistake. Just to need to put "v1.0" in version field. So, for example:

<script>
function loadGapi(){
gapi.client.setApiKey('AIzaSyBvg9bSWGUHhAO-TPIww3KuKhJqC2_BAFk');
gapi.client.load('myCustomApi', 'v1.0', function() {
    gapi.client.myCustomApi.list().execute(function(resp) {
        console.log(resp);
    });
  }, 'https://my-backend-project.appspot.com/_ah/api');
}
</script>

<script src="https://apis.google.com/js/client.js?onload=loadGapi"> </script>