Looks like curl (if c-ares isn't available) will spawn a thread per resolve, so slow resolves don't block others...
It's hard to decide on what a basic default Resolver should do. Some libraries default to blocking the same thread.
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I'd say it depends. Care to open an issue with a more detailed proposal?
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Why bother with the system’s resolver at all? I’ve become convinced resolution is a layer 7 issue.
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I'd love to just use trust-dns, but when I made that the default in reqwest, I got a bunch of reports about weird edge cases

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Is there a reason we can’t incorporate that into configurable libraries, and then have a common and portable resolution system? We can make that as robust as the best OS and then bring that to any application on any OS.
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