SignalR on IIS 7.5 always uses Long Polling with every browser

I know that SignalR has a hierarchy of transport methods: Websocket-> Server-Sent Events-> Forever Frame-> Long Polling

But when I check the console in every browser, I noticed that the transport is always a long poll.

I use Windows 7, IIS Express 7.5 and Visual Studio 2013 (of course, SignalR 2.0).

I know that Websocket is only supported with IIS 8, but at least SSE or Forever Frame for IE should work.

For example, in Google Chrome, I get the following:

Does this mean that Chrome is trying to use SSE correctly? But why is it canceled?

And here is a screenshot of Fiddler with Internet Explorer:

... 200. ( ? 4040, 11437?) , IE SSE.

, SSE/Forever Frame IIS 7.5, ?

!

PS: ,