GitHub user dosubot[bot] added a comment to the discussion: Custom "Download Raw Data" button for dashboards/charts using the underlying dataset
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If you must use it from a backend, you'd first need to authenticate (e.g., session cookie), then call `GET /api/v1/security/csrf_token/` to obtain a token [[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/security/api.py), and pass it as the `X-CSRF-Token` header on subsequent requests. That said, this endpoint wasn't designed for external backend usage. **Why `/api/v1/chart/data` returns 403 with a Guest Token:** Guest tokens are **dashboard-scoped**, not dataset-scoped [[3]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/security/manager.py) [[4]](https://app.dosu.dev/a28d3c7e-a9d3-459e-9fb6-3a6f9ff4f357/documents/3591f9fe-e5ac-49fc-95e4-b2f6cf8715f7). The JWT only contains `resources` referencing specific dashboards (by ID or UUID), not datasets. When you call `/api/v1/chart/data` directly from your ASP.NET backend, the security manager validates dataset access through the dashboard → chart → datasource chain. A few things can cause the 403: 1. **The request isn't associated with an authorized dashboard.** Guest tokens authorize charts *via their parent dashboard*. A standalone `/api/v1/chart/data` call may not carry the dashboard context needed for the security manager to trace back to an authorized resource [[5]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/dashboards/filters.py). 2. **The guest role lacks required permissions.** The guest user gets assigned a role configured via `GUEST_ROLE_NAME`. This role needs permissions like `can read on Chart`, `can read on Dataset`, and `datasource access on [your_datasource]` [[6]](https://github.com/apache/superset/discussions/42547) [[7]](https://github.com/apache/superset/discussions/38461#discussioncomment-17393172). 3. **Bootstrap endpoint failures.** If the guest role lacks `can read on CurrentUserRestApi`, you may get 403s during frontend bootstrap before any data query runs [[6]](https://github.com/apache/superset/discussions/42547). **Recommended approach for your use case (backend-to-backend raw data download):** Rather than using the Guest Token (which is designed for browser-based embedded dashboard access), use **session-based authentication** from your ASP.NET backend: 1. Call `POST /api/v1/security/login` with a **service account** that has `datasource access` on the relevant datasets plus `can read on Chart` permissions. 2. Extract the session cookie from the response. 3. Fetch a CSRF token via `GET /api/v1/security/csrf_token/` using that session cookie [[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/security/api.py). 4. Call `POST /api/v1/chart/data` (or `/api/v1/datasource/samples`) with both the session cookie and CSRF token. This approach will properly respect RLS, Jinja templates, and dataset permissions based on the service account's role — giving you full control over what data can be accessed. If you specifically need to stick with Guest Tokens, ensure: - The dashboard containing the chart is listed in the token's `resources` array - The `GUEST_ROLE_NAME` role has `datasource access` on the target datasource - You're passing the token in the `X-GuestToken` header [[3]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/security/manager.py) Would you like me to dig into the specific code paths for either approach? <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](<https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=apache%2Fsuperset>).* --- Share context across your team and agents. Try [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-tagline&utm_term=apache%2Fsuperset). 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