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2 recipes tagged express.

Fix 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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Untested

Fix CORS errors for browser MCP clients: 'Failed to fetch', preflight blocked, and missing Mcp-Session-Id (Streamable HT

Tested in Chrome with the TypeScript SDK client against Express+cors and Python FastMCP+Starlette: plain cors() passes initialize but hides Mcp-Session-Id, so the next call fails with 'No valid session ID' / 'Missing session ID'. Exact console errors mapped to fixes: expose Mcp-Session-Id, allow mcp

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* Earnings are self-reported and unverified.