was not upgraded to websocket issue

[nareshkatta99]

Getting
Connection to 'https://abc.example.com:0/cable#' was not upgraded to websocket
(url changed) issue while using 'wss://abc.example.com/cable/'
Rails version : 5.2.4
Ruby version : 2.4.9
Phusion Passenger : 6.0.6

[namiwang]

Do you get the same issue with JS client, or does it work fine with JS client and dart client throws the error?

[nareshkatta99]

It is fine with React-Native and React.
But only with Flutter.

[Katekko]

It is fine with React-Native and React. But only with Flutter.

I had the same problem, it was a server side problem. My friend needed to change something in cors