How to access Atlassian Connect Express backend end points from frontend JS

Hi @frederictardieu @daniel

In our connect add-on, have added the same code. But cannot access the data, as 401 error code is thrown when using addon.checkValidToken(). Here is my server side code,

app.get('/test', addon.checkValidToken(), function(req, res){
	....
});

and client side code,

$.ajax({
	type: "GET",
	url: "/test",
	dataType: "json",
	beforeSend: function (xhr) {
		xhr.setRequestHeader("Authorization", "JWT {{token}}");
	},
	success: function(data){
		alert("success");
	}
});

Already, I have posted a question here. What changes has to be done here? Or how can I check jwt token using checkValidToken(). Thanks in advance.