use proxy function

server/src/mcpProxy.ts

@@ -0,0 +1,30 @@
+import { Transport } from "mcp-typescript/shared/transport.js";
+
+export default function mcpProxy({
+  transportToClient,
+  transportToServer,
+  onerror,
+}: {
+  transportToClient: Transport;
+  transportToServer: Transport;
+  onerror: (error: Error) => void;
+}) {
+  transportToClient.onmessage = (message) => {
+    transportToServer.send(message).catch(onerror);
+  };
+
+  transportToServer.onmessage = (message) => {
+    transportToClient.send(message).catch(onerror);
+  };
+
+  transportToClient.onclose = () => {
+    transportToServer.close().catch(onerror);
+  };
+
+  transportToServer.onclose = () => {
+    transportToClient.close().catch(onerror);
+  };
+
+  transportToClient.onerror = onerror;
+  transportToServer.onerror = onerror;
+}