When a client connects to an MCP server using SSE transport and disconnects before the server sends any events:

1. Server sends http.response.start (HTTP 200 + headers)
2. Client disconnects before any SSE events are generated
3. Server never sends http.response.body message

Location

I'm limited with how much additional information I can provide. I'm working with my enterprise Open Source team to figure out the proper way to navigate this.