codeant-ai-for-open-source[bot] commented on PR #38513:
URL: https://github.com/apache/superset/pull/38513#issuecomment-4045996023
## **Sequence Diagram**
This PR fixes legacy chart CSV and Excel downloads by generating a relative
explore URL before posting form data, preventing double host URL construction.
It also adds backend Excel file generation and unified export permission checks
for both CSV and XLSX.
```mermaid
sequenceDiagram
participant User
participant DashboardUI
participant ExploreUtils
participant Backend
participant Security
participant ExportGenerator
User->>DashboardUI: Click Download CSV or Download Excel
DashboardUI->>ExploreUtils: Call exportChart for legacy chart
ExploreUtils->>ExploreUtils: Build relative explore URL with csv or xlsx
flag
ExploreUtils->>Backend: Post legacy export request
Backend->>Security: Check data export permission
Security-->>Backend: Permission granted
Backend->>ExportGenerator: Generate csv or xlsx file from chart data
ExportGenerator-->>DashboardUI: Return file download response
DashboardUI-->>User: Start file download
```
---
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