Can I get via javascript the HTTP expires header of a HTTP resource? -

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my page needs know when cache included javascript file expire, retrieve again.

the xmlhttprequest object has getresponseheader method can call:

// following script: var client = new xmlhttprequest(); client.open("get", "test.txt", true); client.send(); client.onreadystatechange = function() {     if (this.readystate == 2) {         alert(client.getresponseheader("expires"));     } }

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