Hello Mark

Thank you very much for your advice. I misunderstood meaning of some caching properties in HTTP header before. After you advice I read HTTP 1.1 RFC (14.9 from RFC 26156, http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.3). I use now in my server response “Cache-Control: max-age=0“ in the HTTP header together with setting ETag.

Hello Tony!

Now it seems to me I understand at the end the meaning of nd parameter in URL of GET requests. I found out, that IE8 use incorrect caching on ajax GET-requests. It sends no request to server, but gets the old data direct from the cache. If one loads the same data directly in IE8-GUI, it works without any problems. This problem is known und discussed in Internet. I found no other solution as switching off the caching for IE8. It can be done for example with respect of nd parameter

beforeRequest: function() {

Great! I already waiting for the first 3.6 beta!