How to get current page size in KB using just javascript?

Question

Referring to this question , how can i get the current page size in kb, this size i will use to know the connection speed for this page.

Answer 1

There is a non-standard property available only for IE - document.fileSize MDN MSDN. It returns the size of the html page in bytes.

Or you can get the content-length header

var request = new XMLHttpRequest();
request.open('GET', document.location, false);
request.send();
var size = request.getAllResponseHeaders().toLowerCase().match(/content-length: \d+/);
document.getElementById("size").innerHTML = size + " bytes";

1. Example with text only;
2. Example geting the size of image;
3. Example with content-length