When you copy this link
http://q55.queue.vkontakte.ru/im639
and place it to currect browser tab, press enter, it does “load”, address changes, but content is still the same (you’re still in this question). What’s that? Is that programmatical behavior ?
I am not seeing anything. It does not do anything because nothing is available.
We get status code
HTTP/1.1 204 No ContentAlso this has nothing to do with long-polling, because the connection is not hanging at all. It looks like the URL is pointing to an image. I can not image you should be doing long-polling for retrieving a simple image.