ASP.NET MVC 5 concurrent requests are queued even with disabled Session

Question

Before thinking about downvoting or telling me \"google it\", please read the problem more carefully. This is old/classic problem but old/classic solution is no longer worki

Answer 1

Concurrent parallel requests worked for me when I decorated my controller with this attribute

[SessionState(System.Web.SessionState.SessionStateBehavior.ReadOnly)]

It works better than the above disabling session state and was added back in MVC 3. More info here

Answer 2

I spent a lot of time on this issue and found much of the information that you saw above also did not correct the issue. My parallel requests were always queuing, I saw this in Internet Explorer as well as Firefox.

I found this article related to am using an MVC application this article

This shows that you can use Disabled [SessionState(SessionStateBehavior.Disabled)] instead of setting it to ReadOnly.

I moved my code that was performing the AJAX GET call to its own controller since I had other code in the current controller that used Session via TempData. This corrected my issue and my $.get() call to the controller with session disabled would process in parallel with the $.post() to the other controller that used session.