// Issue an HTTP GET request for the contents of the specified URL. // When the response arrives, pass it to the callback function as a // parsed XML Document object, a JSON-parsed object, or a string. function get(url, callback) { var request = new XMLHttpRequest(); // Create new request"GET", url); // Specify URL to fetch request.onreadystatechange = function() { // Define event listener // If the request is compete and was successful if (request.readyState === 4 && request.status === 200) { // Get the type of the response var type = request.getResponseHeader("Content-Type"); // Check type so we don't get HTML documents in the future if (type.indexOf("xml") !== -1 && request.responseXML) callback(request.responseXML); // Document response else if (type === "application/json") callback(JSON.parse(request.responseText)); // JSON response else callback(request.responseText); // String response } }; request.send(null); // Send the request now }
Checks the “Content-Type” header of the response and handles “application/json” responses specially. Another response type that you might want to “decode” specially is “application/javascript” or “text/javascript”.

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