TypeError: Only absolute URLs are supported

[Hassnain-Alvi]

I need to use sub tiers url to test my workers but when i pass the URL in form of
https://example.com/hello/world/abcdef-123456-gfcvmh it raises an unhandled exception below:

node:21730) UnhandledPromiseRejectionWarning: TypeError: Only absolute URLs are supported

How can i test complex URLs with workers?

[transitive-bullshit]

I got this as well when I accidentally passed a Promise as the URL instead of awaiting a response.

The error message could definitely be clearer if we don't pass a string or an instance of URL.