tamarinkeisari opened a new issue, #30368:
URL: https://github.com/apache/superset/issues/30368

   Seeing a bug with csv or text alerts on 3.0.0rc1, which were working fine on 
2.1.0. 
   
![image](https://github.com/apache/superset/assets/29596014/58146b12-376a-4c83-b345-0aed7a117615)
   PNG is working fine on 3.0.0rc1 (which rules out auth/selenium issues), but 
CSV and text are failing with:
   ```
   A downstream exception occurred while generating a report: 
b056bed4-ff76-4e1d-aa0f-0fa7751d3542. Failed generating csv HTTP Error 400: BAD 
REQUEST
   Traceback (most recent call last):
     File "/app/superset/reports/commands/execute.py", line 262, in 
_get_csv_data
       csv_data = get_chart_csv_data(chart_url=url, auth_cookies=auth_cookies)
     File "/app/superset/utils/csv.py", line 91, in get_chart_csv_data
       response = opener.open(chart_url)
     File "/usr/local/lib/python3.9/urllib/request.py", line 523, in open
       response = meth(req, response)
     File "/usr/local/lib/python3.9/urllib/request.py", line 632, in 
http_response
       response = self.parent.error(
     File "/usr/local/lib/python3.9/urllib/request.py", line 561, in error
       return self._call_chain(*args)
     File "/usr/local/lib/python3.9/urllib/request.py", line 494, in _call_chain
       result = func(*args)
     File "/usr/local/lib/python3.9/urllib/request.py", line 641, in 
http_error_default
       raise HTTPError(req.full_url, code, msg, hdrs, fp)
   urllib.error.HTTPError: HTTP Error 400: BAD REQUEST
   ```
   
   _Originally posted by @padbk in 
https://github.com/apache/superset/discussions/24581#discussioncomment-6425918_
   
   
   I'm encountering the same error in superset version 4.0.2,
   Can someone please help?


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