What does the error message "Failed to load resource: the server responded with a status of 426 (Upgrade Required)" indicate in the context of React and Node?

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The error message "Failed to load resource: the server responded with a status of 426 (Upgrade Required)" indicates that the server requires the client to upgrade to a newer protocol version to continue communication. This error can occur in the context of React and Node when the HTTP request made by the client is using an outdated or unsupported protocol version, and the server can no longer understand the request. It is recommended to check the server settings and upgrade the client's protocol version to resolve this error.