api, playback: add CORS headers on non-existing pages too (#1792)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.06%. Comparing base (51387e8) to head (2574c79). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3410 +/- ## ========================================== + Coverage 54.04% 54.06% +0.02% ========================================== Files 190 190 Lines 18829 18847 +18 ========================================== + Hits 10176 10190 +14 - Misses 7854 7858 +4 Partials 799 799 ```

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[github-actions[bot]]

This issue is mentioned in release v1.8.3 🚀 Check out the entire changelog by clicking here