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I am experimenting with long polling XMLHttp Requests (XHR) on this page. Having Avast antivirus installed I noticed that its web shield effectively blocks the use of readyStates<4. Adding an exception for text/xml mime types in the web shield configuration solves this. But is there a way to solve this programmatically? I searched the net thouroughly, but didn't find solutions until now. This page looked promising, but didn't work.