Question

Is it possible to do a HTTP Head request solely using an XMLHTTPRequest in JavaScript?

My motivation is to conserve bandwidth.

If not, is it possible to fake it?

Was it helpful?

Solution

Easy, just use the HEAD method, instead of GET or POST:

function UrlExists(url, callback)
{
    var http = new XMLHttpRequest();
    http.open('HEAD', url);
    http.onreadystatechange = function() {
        if (this.readyState == this.DONE) {
            callback(this.status != 404);
        }
    };
    http.send();
}

This is just a short example to show how to use the HEAD method. Production code may need more fine-grained callbacks for different result states (success, failure, timeout), and may use different event handlers (onload, onerror and ontimeout rather than onreadystatechange).

OTHER TIPS

An XMLHTTPRequest object should have

getAllResponseHeaders();
getResponseHeader("header-name")

defined on it

Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow
scroll top