Null method received in LSP client

[esafak]

I am writing a new nim plugin for IntelliJ and I encountered this error:

2025-07-20 17:58:55,781 [   3795]   WARN - org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint - Unsupported notification method: extension/statusUpdate
2025-07-20 17:59:04,569 [  12583]   WARN - org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint - Unsupported notification method: extension/statusUpdate
2025-07-20 17:59:04,569 [  12583] SEVERE - org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer - Unable to identify the input message.
com.google.gson.JsonParseException: Unable to identify the input message.
	at org.eclipse.lsp4j.jsonrpc.json.adapters.MessageTypeAdapter.createMessage(MessageTypeAdapter.java:403)
	at org.eclipse.lsp4j.jsonrpc.json.adapters.MessageTypeAdapter.read(MessageTypeAdapter.java:139)
	at org.eclipse.lsp4j.jsonrpc.json.adapters.MessageTypeAdapter.read(MessageTypeAdapter.java:56)
	at com.google.gson.Gson.fromJson(Gson.java:1227)
	at com.google.gson.Gson.fromJson(Gson.java:1186)
	at org.eclipse.lsp4j.jsonrpc.json.MessageJsonHandler.parseMessage(MessageJsonHandler.java:119)
	at org.eclipse.lsp4j.jsonrpc.json.MessageJsonHandler.parseMessage(MessageJsonHandler.java:114)
	at com.intellij.platform.lsp.impl.connector.Lsp4jServerConnector$createMessageJsonHandler$1.parseMessage(Lsp4jServerConnector.kt:158)

I set some breakpoints and determined that the method was null, instead of extension/statusUpdate or whatever. This happens after the "Nimsuggest initialized for..." and eventually exits with code 139, having failed to initialize on time.

I realize this may not be a bug; I would have asked this question in the discussions if they were enabled.

[jmgomez]

Cant you just add a new Generic Endpoint in the client and leave it empty?

[esafak]

I'll try, but I'd like to understand why these null methods are sent.

[jmgomez]

The extension/update its a custom endpoint that send info relative to the current state of the nimsuggest instances to the client. Its implemented in vscode in case you want to take a look. Other lsp clients deal with it without issues ignoring it (without a fake implementation). Not sure whats going on with IntelliJ but we are also open to accept a PR that opts-out it

[esafak]

I don't see a extension/update; could you point me at the right handler so I can study it? Did you mean extension/statusUpdate, handled here?

[jmgomez]

I don't see a extension/update; could you point me at the right handler so I can study it? Did you mean extension/statusUpdate, handled here?

Yes, sorry for the confusion