codeant-ai-for-open-source[bot] commented on PR #38513:
URL: https://github.com/apache/superset/pull/38513#issuecomment-4030188030
## **Sequence Diagram**
This PR fixes CSV and Excel downloads for legacy chart types by having the
frontend build relative explore_json URLs for exports and adding XLSX handling
and permission checks on the backend.
```mermaid
sequenceDiagram
participant User
participant Frontend
participant Backend
User->>Frontend: Request CSV or Excel download for legacy chart
Frontend->>Frontend: Detect legacy chart and desired format
Frontend->>Backend: POST explore_json with form_data and csv/xlsx flag
using relative URL
Backend->>Backend: Determine response type and validate export permission
alt CSV export
Backend->>Backend: Generate CSV from query data
Backend-->>User: CSV file download
else XLSX export
Backend->>Backend: Generate Excel from query dataframe (handle empty)
Backend-->>User: Excel file download
end
```
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