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How to return Service Worker with custom HTTP header from custom module

I have a custom module providing a HTML5 Service Worker file under /modules/custom/my_blocks/assets/js/service-worker.js. Since the Service Worker is not located in the root of the Drupal server, I need to return the file with an additional Service-Worker-Allowed HTTP header.

How to do that within my module?

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How to return Service Worker with custom HTTP header from custom module

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