mcp-sse-transport-config-when-using-the-mcp-inspector-to-test-an-sse-transp-0e67872c

THEN Ensure your MCP server includes both the GET /sse and POST /messages endpoints as per the SDK examples. For compatibility with the MCP inspector, you may need to pass a transportType query parameter (e.g., ?transportType=sse) or update to a version of the inspector that handles missing parameters gracefully.

// Server setup for SSE transport
app.get('/sse', async (req, res) => {
  const transport = new SSEServerTransport('/messages', res);
  await server.connect(transport);
});
app.post('/messages', async (req, res) => {
  // Route messages to the correct transport for the session
  const transport = ...;
  await transport.handlePostMessage(req, res);
});