Invalid SSE response. Status code: 400

[pansusu]

reactor.core.Exceptions$ErrorCallbackNotImplemented: io.modelcontextprotocol.spec.McpTransportException: Invalid SSE response. Status code: 400 Line: Session ID required in mcp-session-id header
Caused by: io.modelcontextprotocol.spec.McpTransportException: Invalid SSE response. Status code: 400 Line: Session ID required in mcp-session-id header

SSE 和 streamable 共用了一个HttpClientSseClientTransport？？

[wuxiansen]

Thanks for reporting this!

Based on the error alone, it’s a bit tough to tell what’s going wrong.
Could you share a bit more context, like:

• A more complete log around the error
• Relevant code snippets showing how the SSE / streamable client is set up

With that info, it’ll be much easier to figure out what’s happening.