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var concurrency int
flag.IntVar(&concurrency, "concurrency", 50, "Max Concurrent Requests")
// ...
concurrentGoroutines := make(chan bool, concurrency)
var wg sync.WaitGroup
for _, url := range urls {
wg.Add(1)
go func(url string) {
defer wg.Done()
concurrentGoroutines <- true
MakeRequest(url)
<-concurrentGoroutines
}(url)
}
wg.Wait()
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