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JavaScript MCQs

Which of the following code snippets will return all HTTP headers?

var req = new XMLHttpRequest(); req.open('GET', document.location, false); req.send(null); var headers = req.getAllResponseHeaders().toLowerCase(); alert(headers);

var req = new XMLHttpAccess(); req.open('GET', document.location, false); req.send(null); var headers = req.getAllResponseHeaders().toLowerCase(); alert(headers);

var req = new XMLHttpRequest(); req.open('GET', document.location, false); req.send(null); var headers = req.getResponseHeader().toLowerCase(); alert(headers);

var req = new XMLHttpRequestHeader(); req.open('GET', document.location, false); req.send(null); var headers = req.retrieveAllResponseHeaders().toLowerCase(); alert(headers);

Answer

Correct Answer: var req = new XMLHttpRequest(); req.open('GET', document.location, false); req.send(null); var headers = req.getAllResponseHeaders().toLowerCase(); alert(headers);

Explanation:

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