Unsupported API version 1.1, unless called with an OAuth header

I am trying to use pub-sub method to subscribe to the events of a specific user. I am able to successfully authenticate the user but when I call the pub-sub url I get the following error.

{"meta":{"error_detail":"Unsupported API version 1.1, unless called with an OAuth header","code":404,"error_type":"endpoint_error","time":1480394928,"message":"Not Found","user_xid":""},"data":{}}

Code: This code is called inside the success callback of the OAuth2.0 Authentication.

var subscription_url = "https://jawbone.com/nudge/api/v.1.1/users/@me/pubsub?webhook=https://*****/pushJawbone";
$http.post(
    subscription_url, {
       headers: {
        'Authorization': "Bearer " + accessToken
       }
    }
).success(
    function(response) {
       console.log("Jawbone User Subscription Successful" + response);
    }
).error(
    function(error) {
       console.log("Jawbone sub unsucessful: " + JSON.stringify(error));
     }
)

The issue is not Jawbone API. The problem was in the angular $http method. For some reason with the above code it is not sending the headers at all so the OAuth error. It works fine when I use the below code.

$http({
     method: 'POST',
     url: subscription_url,
     headers: {
          'Authorization': 'Bearer ' + accessToken
     }
}).success(
    function(response) {
         console.log("Jawbone User Subscription Successful" + response);

    }
).error(
    function(error) {
         console.log("Jawbone sub unsucessful: " + JSON.stringify(error));
    }
)

Thanks Ray for all the help.