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Re:Cancelable Promises: Why was this proposal withdrawn? by Manishearth on Monday December 19, 2016 @01:32PM (#13213696)
I mean, this isn't new. When you make a POST request in JS a bad network may mean that it gets delivered but errors out on your end. You need to code your application to be robust to this anyway.
Re:Cancelable Promises: Why was this proposal withdrawn? by pacaro on Monday December 19, 2016 @02:09PM (#13214058)
This. Absolutely.

Those applications that already aren't robust to this (I sadly assume that is most) aren't going to be helped by cancellation