Errors from net/http are wrapped in an url.Error to contain information about
the request that failed. You can unwrap it with an assertion or type switch;
_, err := http.DefaultClient.Do(r)
if urlErr, ok := err.(*url.Error); ok {
log.Println(urlErr.Err == context.Canceled) // “true", in your example
}
//jb
On 8 Nov 2017, at 13:11, Glen Huang
<hey....@gmail.com<mailto:hey....@gmail.com>> wrote:
Yes. Thanks for point it out, and maybe I should've mentioned that.
After posing that on SO, I have a gut feeling that it should be the intuitive
way to check that. I was hoping a go author could see the question here and
maybe offer some rationale why that's not the case.
Sorry if it's considered spamming.
On Wednesday, November 8, 2017 at 8:07:51 PM UTC+8, Ain wrote:
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<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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