| 48 | // --------------------------------------------------------------------------- |
| 49 | |
| 50 | async function startStreamableHTTP(app: express.Express): Promise<void> { |
| 51 | // Map of session ID -> transport |
| 52 | const transports = new Map<string, StreamableHTTPServerTransport>(); |
| 53 | |
| 54 | app.post("/mcp", async (req, res) => { |
| 55 | const sessionId = |
| 56 | (req.headers["mcp-session-id"] as string) ?? undefined; |
| 57 | let transport = sessionId ? transports.get(sessionId) : undefined; |
| 58 | |
| 59 | if (!transport) { |
| 60 | // New session |
| 61 | const server = createServer(); |
| 62 | transport = new StreamableHTTPServerTransport({ |
| 63 | sessionIdGenerator: () => randomUUID(), |
| 64 | }); |
| 65 | await server.connect(transport); |
| 66 | |
| 67 | // Store session after first request so we can retrieve it later |
| 68 | transport.onclose = () => { |
| 69 | if (transport!.sessionId) { |
| 70 | transports.delete(transport!.sessionId); |
| 71 | } |
| 72 | }; |
| 73 | } |
| 74 | |
| 75 | await transport.handleRequest(req, res, req.body); |
| 76 | |
| 77 | // After handling, store with the now-known session ID |
| 78 | if (transport.sessionId && !transports.has(transport.sessionId)) { |
| 79 | transports.set(transport.sessionId, transport); |
| 80 | } |
| 81 | }); |
| 82 | |
| 83 | // SSE stream endpoint for Streamable HTTP |
| 84 | app.get("/mcp", async (req, res) => { |
| 85 | const sessionId = req.headers["mcp-session-id"] as string | undefined; |
| 86 | if (!sessionId || !transports.has(sessionId)) { |
| 87 | res.status(400).json({ error: "Invalid or missing session ID" }); |
| 88 | return; |
| 89 | } |
| 90 | const transport = transports.get(sessionId)!; |
| 91 | await transport.handleRequest(req, res); |
| 92 | }); |
| 93 | |
| 94 | // DELETE — session cleanup |
| 95 | app.delete("/mcp", async (req, res) => { |
| 96 | const sessionId = req.headers["mcp-session-id"] as string | undefined; |
| 97 | if (sessionId && transports.has(sessionId)) { |
| 98 | const transport = transports.get(sessionId)!; |
| 99 | await transport.close(); |
| 100 | transports.delete(sessionId); |
| 101 | } |
| 102 | res.status(200).json({ ok: true }); |
| 103 | }); |
| 104 | } |
| 105 | |
| 106 | // --------------------------------------------------------------------------- |
| 107 | // Legacy SSE transport (for older clients) |