jakubhruby opened a new pull request, #35641:
URL: https://github.com/apache/superset/pull/35641
### SUMMARY
When app root prefix is applied (e.g. `SUPERSET_APP_ROOT="/app-prefix"`),
it's applied twice - e.g. when exporting graph to CSV
```javascript
// in this handler url is build with appRoot prefix
exportChart = async (...) => {
...
url = ensureAppRoot('/api/v1/chart/data');
// now the url is /app-prefix/api/v1/chart/data
// postForm is called with prefixed url
SupersetClient.postForm(url, ...)
...
}
// this method is called with already prefixed url
async postForm(endpoint, ...) {
...
hiddenForm.action = this.getUrl({ endpoint });
// now the url is /app-prefix/app-prefix/api/v1/chart/data
...
}
```
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
<img width="1430" height="867" alt="Snímek obrazovky z 2025-10-14 14-53-35"
src="https://github.com/user-attachments/assets/cb224e24-3d58-4bba-9237-cec528c454d9";
/>
### TESTING INSTRUCTIONS
Test downloading CSV file.
### ADDITIONAL INFORMATION
- [ ] Has associated issue:
- [ ] Required feature flags:
- [ ] Changes UI
- [ ] Includes DB Migration (follow approval process in
[SIP-59](https://github.com/apache/superset/issues/13351))
- [ ] Migration is atomic, supports rollback & is backwards-compatible
- [ ] Confirm DB migration upgrade and downgrade tested
- [ ] Runtime estimates and downtime expectations provided
- [ ] Introduces new feature or API
- [ ] Removes existing feature or API
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