Is workspace/didChangeConfiguration must be send on LSP client when server is initialized?

[angelozerr]

We are developping an LSP client for IntelliJ with LSP4IJ and I have noticed that vscode send a workspace/didChangeConfiguration when server is started.

I have not found some specification about that, it is the reason why I create this issue.

I have the impression that workspace/didChangeConfiguration must be sent when server is started (when initialized is done), but if we do that, some language servers could not support workspace/didChangeConfiguration and throw an error.

The server can register with dynamic regsitration that the server support configuration, should we use that? My main problem is that some language server doesn't send this dynamic registration although they support workspace/didChangeConfiguration

How vscode manage that?

Thanks for your clarification!