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var url = "http://api.sample.com/resource";
var client = new XMLHttpRequest();

client.open("GET", url, false);

client.setRequestHeader("Content-Type", "application/json");

client.send();

if (client.status == 200)
    alert("The request succeeded: " + client.responseText)
else
    alert("The request failed: " + client.status + " " + client.statusText + ".");