GitHub user dosubot[bot] added a comment to the discussion: How can I integrate Superset charts with PlayWright to ensure that all charts and data on the page are fully rendered and there are no unexpected errors before taking a screenshot?
<!-- Answer --> A 502 Bad Gateway error during chart rendering in Superset usually means the backend or a proxy (like nginx) failed to process a chart data request—often due to server load, network issues, or timeouts. Superset and Playwright can only wait for the page and chart containers to load, but they can't fix server-side errors; if the API returns a 502, the chart will show an error and the screenshot will capture that state. To reduce these errors and ensure all data is loaded before screenshots: - Superset has built-in retry logic for transient 502/503/504 errors when fetching chart data. You can tune this in `superset_config.py` with settings like `SUPERSET_CLIENT_RETRY_ATTEMPTS`, `SUPERSET_CLIENT_RETRY_DELAY`, and related options. This helps automatically retry failed chart data requests before giving up, making dashboards more resilient to temporary backend issues [[details](https://github.com/apache/superset/pull/34290)]. - Increase timeouts for chart rendering and screenshot automation: set `SCREENSHOT_LOCATE_WAIT` and `SCREENSHOT_LOAD_WAIT` to higher values (e.g., 60–120 seconds) to give slow charts more time to load [[details](https://github.com/apache/superset/issues/5993#issuecomment-2828358239)]. - Make sure your Playwright script waits for all `.chart-container` elements to be visible and all `.loading` elements to disappear before taking a screenshot. This ensures the page is as "ready" as possible [[details](https://github.com/apache/superset/discussions/36839)]. - If you see persistent 502 errors, check Superset server logs, database health, and proxy/gateway timeout settings (e.g., `proxy_read_timeout` in nginx). High server load, slow queries, or restrictive proxy timeouts are common causes [[details](https://github.com/apache/superset/discussions/31743#discussioncomment-11767901)]. - For intermittent errors, the retry logic and increased timeouts usually help. For persistent errors, you may need to optimize your queries, increase server resources, or adjust proxy/database timeouts. If you want to programmatically detect error states in Playwright, look for elements with `role="alert"` and extract error messages from `.antd5-modal-content .antd5-modal-body` before taking the screenshot. If you see a 502 error message, you can choose to retry, log, or fail the test as appropriate. Let me know if you want example config snippets or more troubleshooting steps for your environment. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot).* --- <sup>How did I do? 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