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Bug description
I am getting the following errors from my MCP:

ERROR io.modelcontextprotocol.server.transport.HttpServletStatelessServerTransport - Failed to handle request: Missing handler for request type: notifications/initialized

Environment
version 17.1 of the MCP SDK. Running kotlin

Steps to reproduce
Unable to reproduce - seems like a client is more up to date on the spec than we are but I haven't been able to determine which

Expected behavior
I wouldn't expect anything a client says to my server to fail the protocol. I think we need an additional handler? Maybe I am dumb but in the past when I had this issue for tools et all, I just needed to explicitly say that I don't support them:

    private val SERVER_CAPABILITIES: McpSchema.ServerCapabilities = McpSchema.ServerCapabilities.builder()
        .prompts(true)
        .tools(false)
        .resources(false, false)
        .completions()
        .build()

however there is not a "notifications" capability

Minimal Complete Reproducible example
Unable to reproduce right now. I am guessing some update was made to MCP which we don't have yet in 17.1