带有Socket.io的Node.js - Long Polling失败并抛出“code”：1，“message”：“Session ID unknown”响应

I'm stuck on why a node.js app that was moved to an IIS7 server is now failing. I know IIS7 doesn't support web sockets but my understanding was that socket.io would fall back to long polling if web socket isn't available. So now when the user tries to press a specific button which would normally have required the socket or long polling I get something like this:I'm stuck on why a node.js app that was moved t