dosubot[bot] commented on issue #38429: URL: https://github.com/apache/superset/issues/38429#issuecomment-4002680114
<!-- Answer --> This is a configuration issue caused by the `WEBDRIVER_BASEURL_USER_FRIENDLY` setting. The port 8888 comes from a [hardcoded value in the Docker development configuration](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/docker/pythonpath_dev/superset_config.py#L104-L108), which incorrectly differs from the actual Superset port 8088. **To fix this**, set the correct value in your `superset_config.py`: ```python WEBDRIVER_BASEURL = "http://superset_app:8088/"; # Internal URL for screenshots WEBDRIVER_BASEURL_USER_FRIENDLY = "http://localhost:8088/"; # External URL for notifications ``` The [alert URL construction uses `WEBDRIVER_BASEURL_USER_FRIENDLY`](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/utils/urls.py#L25-L42) as the base when building webhook payload URLs. **Note on `form_data` vs `form_data_key`**: The `form_data` parameter is actually correct behavior for alerts. Alert URLs [embed the chart ID directly in the form_data parameter](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/commands/report/execute.py#L218) as `{"slice_id": 73}` to create self-contained URLs that don't depend on Redis cache state. The `form_data_key` you see in the browser is used for complex explore sessions. The missing hostname (`http://:8888`) suggests `WEBDRIVER_BASEURL_USER_FRIENDLY` may be set to something like `:8888/` instead of a full URL. This is worth filing a PR to fix the default Docker configuration since it's a clear bug. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? 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