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Update readme file to include a tip to allow mcp-session-id in CORS when

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Achintha Isuru 2025-06-15 21:47:53 -04:00
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README.md
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@ -307,6 +307,21 @@ app.delete('/mcp', handleSessionRequest);
app.listen(3000);
```
> [!TIP]
> When using this in a remote environment, make sure to allow the header parameter `mcp-session-id` in CORS. Otherwise, it may result in a `Bad Request: No valid session ID provided` error.
>
> For example, in Node.js you can configure it like this:
>
> ```ts
> app.use(
> cors({
> origin: '*',
> exposedHeaders: ['mcp-session-id'],
> allowedHeaders: ['Content-Type', 'mcp-session-id'],
> })
> );
> ```
#### Without Session Management (Stateless)
For simpler use cases where session management isn't needed: