[whatwg/fetch] When there is an issue with the URL parameter, fetch does not have any errors (Issue #1730)

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

When using fetch in a project, it is possible that the URL parameter may not be the correct value and may be a meaningless string. However, the fetch has no errors and the status code is 200. The response. text() returns the current page.
I'm not sure if this is a bug or if it was caused by myself

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