SignalR js client doesn't fallback to LongPolling when it fails to connect with server side events
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- C#
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Description
### Describe the bug
SignalR js client doesn't fallback to LongPolling when it fails to connect with server side events.
### To Reproduce
Setup the scenario described in #20498
The following is logged and it doesn't try to connect with LongPolling after SSE fails.
These are the network calls made.
### Second scenario
I also had the issue in another scenario where I think a local firewall is messing with the connection where it won't fallback to LongPolling.
There this is logged.
And these network calls are made.
When I use an old version of ASP.Net SignalR on the same server the fallback to LongPolling works as expected.
### Further technical details
- ASP.NET Core version 3.1
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Assessment
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