ajax 关闭 keep alive,javascript - Ajax Request header keep alive - Stack Overflow

I have Ajax request to update the client page if any new data is available to server.I have set the connection 'keep-Alive' So here I am not making new Ajax call every time to check the updated data. I have callback which update the page if any records is available.

Below is my Ajax Request.

xmlRequest.open("post", url, true);

xmlRequest.setRequestHeader("Connection", "Keep-Alive");

xmlRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");

xmlRequest.send(some data);

It works fine, but if user refresh the browser then, Ajax does not get the updated data from server.

My concept is not very clear on how the connection type "keep-Alive" works. but it seems when user refresh the browser then Ajax connection lost to the server hence Ajax stopped listing.

I know i can fix this by making new call whenever browser refresh the page. but here i want to understand does it really Ajax keep-Alive lose the connection when browser refresh.