how to get the html document size with js?

Question

How can you get the actual file size(not in pixels,in bytes) of the document a js script is running on? The solution should work in all major browsers.

Answer 1

//

function hrefSize(){
    try{
        var O= new XMLHttpRequest;
        O.open("HEAD", document.URL, false);
        O.send(null);
        if(O.status== 200){
            return O.getResponseHeader('Content-Length');
        }
        else return 0;
    }
    catch(er){
        return 0;
    }
}
alert(hrefSize()+' bytes');

Answer 2

You could propably refetch the page via ajax and get the length of it as a string, but this will be suboptimal because it will trigger another HTTP request and have to wait for it.