Running several GET requests parallel

[Vincent Van Mulders]

I'm trying to use goroutines to perform several http requests to a third party API

I read this: 

The Go runtime environment for App Engine provides full support for goroutines, but not for parallel execution: goroutines are scheduled onto a single operating system thread. This single-thread restriction may be lifted in future versions.

Is this possible in GAE or is http requests using goroutines/parallel impossible with the current runtime?

Trying to use the *http.Request in a goroutine gives me "appengine: NewContext passed an unkown http.Request

[Chris Broadfoot]

Yes, it's possible. You need to be within the context of an incoming request, though.

Something like this:

func handler(w http.ResponseWriter, r *http.Request) {

  ctx := appengine.NewContext(r)

  hc := urlfetch.Client(ctx)

  var wg sync.WaitGroup

  wg.Add(10)

  for i := 0; i < 10; i++ {

    go func() {

      resp, err := hc.Get(...)

      _, _ = resp, err

      wg.Done()

    }()

  }

  wg.Wait()

  io.WriteString(w, "10 requests done")

}

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