UntestedFix MCP 'SSE error: Non-200 status code (405/404)' and other SSE transport errors (deprecated HTTP+SSE vs Streamable HTT
Tested (TS SDK 1.32.1, Express 5): SSE client vs Streamable HTTP server (405), HTTP client vs legacy /sse (404 Cannot POST), 'stream is not readable' from express.json(), 'No transport found for sessionId', and the global-transport bug that hangs the 2nd client or times out the 1st. Plus a tested St
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