I noticed that OP has also posted this question to SO:
https://stackoverflow.com/questions/47179024/how-to-check-if-a-request-was-cancelled


ain


kolmapäev, 8. november 2017 14:02.13 UTC+2 kirjutas Glen Huang:
>
> I have this simple code in which I try to check if the request was 
> cancelled. But surprisingly, it prints false instead of true in go 1.9.
>
> I wonder what's the correct way to check that?
>
> package main
>
>
> import (
>     "context"
>     "log"
>     "net/http"
> )
>
>
> func main() {
>     r, _ := http.NewRequest("GET", "http://example.com";, nil)
>     ctx := context.Background()
>     ctx, cancel := context.WithCancel(ctx)
>     r = r.WithContext(ctx)
>     ch := make(chan bool)
>     go func() {
>         _, err := http.DefaultClient.Do(r)
>         log.Println(err == context.Canceled)
>         ch <- true
>     }()
>     cancel()
>     <-ch
> }
>

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