[whatwg/fetch] Fetch with Flask or Microdot (Issue #1733)

### What is the issue with the Fetch Standard?

Hi,
I opened a discussion on the Micropython forum (https://github.com/orgs/micropython/discussions/13529) and another on a French Python forum (https://www.developpez.net/forums/d2161662/autres-langages/python/general-python/flask-fetch/) which did not give me a satisfactory answer.
My question is: what does the fetch() command do, without then()?
How does it interact with Flask or Microdot?
Most of the answers were that I should read the documentation, which I did. But I couldn't find anything about this particular case. I think I'm finally on the right forum to have a clear explanation.
My program works the way I want it to, but I like to understand what I'm doing
Thanks in advance

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