dosubot[bot] commented on issue #41862:
URL: https://github.com/apache/superset/issues/41862#issuecomment-4907103231

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   <!-- Answer -->
   The most likely cause of your HTTP 500 is a **`SESSION_COOKIE_SECURE = True` 
+ HTTP `WEBDRIVER_BASEURL` mismatch**. In your failing config you have:
   
   ```python
   SESSION_COOKIE_SECURE = True
   WEBDRIVER_BASEURL = "http://superset_app:8088/";  # HTTP, not HTTPS
   ```
   
   When the Celery worker calls the internal CSV endpoint, it attaches the 
session cookie to an HTTP request 
[[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/utils/csv.py#L90-L91).
 But because `SESSION_COOKIE_SECURE = True`, the browser/client layer drops the 
cookie on non-HTTPS connections. The CSV endpoint then receives an 
unauthenticated request and returns 500.
   
   This would also explain why PNG/PDF still work — those go through Playwright 
(which loads the full page over the same internal URL but handles cookies 
differently via the machine auth provider), while CSV uses a bare `urllib` 
request 
[[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/utils/csv.py).
   
   **Fix — choose one:**
   
   1. **(Recommended)** Set `SESSION_COOKIE_SECURE = False` for the internal 
network (safe if your Superset workers and app are on a trusted Docker network):
   
      ```python
      SESSION_COOKIE_SECURE = False
      ```
   
   2. Or switch the internal base URL to HTTPS (requires the app container or a 
sidecar proxy to terminate TLS):
   
      ```python
      WEBDRIVER_BASEURL = "https://superset_app:8088/";
      ```
   
   **Additional things to verify:**
   
   - Confirm the worker can reach `http://superset_app:8088/health` (your 5.0.0 
config used `http://superset:8088/` — if the service name changed, DNS 
resolution inside Docker may also be failing).
   - Check the *app server* logs (not the worker) around `16:01:41` for the 
actual 500 traceback — it will reveal whether the failure is an auth error, 
CSRF rejection, or something else entirely.
   - A recent PR added network timeouts to this code path 
[[3]](https://github.com/apache/superset/pull/41250), which would surface 
pre-existing auth failures faster rather than hanging indefinitely, but it 
isn't itself the cause of the 500.
   
   
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