Golang Context Cancelled on Goroutine

tech · Mar 22, 2021 · ~1 min

Golang’s request context is automatically be done when passed on goroutine, and its parents goroutine is already done.

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package main

import (
  "context"
  "log"
  "net/http"
  "time"
)

func foo(ctx context.Context) {
  ctx, cancel := context.WithTimeout(ctx, 60*time.Second)
  defer cancel()

  req, _ := http.NewRequestWithContext(ctx,
    http.MethodGet, "https://google.com", nil)

  _, err := http.DefaultClient.Do(req)

  log.Println(err) // Get "https://google.com": context canceled
}

func main() {
  http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    go foo(r.Context())
  }) // context will be done when it reaches here

  http.ListenAndServe(":8888", nil)
}

Thank you for reading!

· · ·

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