You don't need to use Event-Source to use SSE, look at how I implemented it here: https://github.com/tinspin/fuse/blob/master/res/play.html#L160 https://github

You don't need to use Event-Source to use SSE, look at how I implemented it here: https://github.com/tinspin/fuse/blob/master/res/play.html#L160 https://github.com/tinspin/fuse/blob/master/res/play.html#L1... The XHR ready state 3 was wrongly implemented in IE7, they fixed it in IE8.