Troubleshooting: fast fixes for common Web and API failures

Tags: troubleshooting, errors, element not found, stale, base url, 401, 415, selector


Fast checks:

WEB
- Confirm the URL.
- Re-check the selector.
- Add wait or retry only when the page state really needs it.

API
- Confirm Base URL.
- Confirm headers and auth.
- Confirm body format and Content-Type.

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