What happens when a page has an upgrade protocol plus a lot of polling, when the protocol is downgraded?

here"s the thing

A page has two left and right blocks
the left side is connected to the socket line, and the right side is in the polling data

when the socket on the left is broken, the data in polling on the right will be unable to request data all the time
Open dev tool and see the header refer-when-downgrade

I would like to ask if there are any buddies who have done any research on this? The relevant experience of this cooperation can not be found on the Internet

Upgrade html5 javascript websocket socket
Mar.07,2021

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