I have a Meteor application and I'm making API calls like:

var urlString = "http://api.stackexchange.com/2.2/users/"+surl;
HTTP.call ("GET", urlString, {params:{site:"stackoverflow"}}, 
    function (error,result) {
        console.log (result.data);
    }
);

At present I'm getting quota-limited to 300 calls only. But I want more than 300 and I have an application key.

How do I request, using the API key, so I can get 10,000 calls per day?