Go HTTP limit connections

limit_connections.go

func limitConnections(handler func(w http.ResponseWriter, r *http.Request), max_connections int) func(w http.ResponseWriter, r *http.           Request) {
   connections := make(chan bool, max_connections)
 
   for i := 0; i < max_connections; i++ {
     connections <- true
   }
 
   return func(w http.ResponseWriter, r *http.Request) {
     select {
     case <-connections:
       defer func() { connections <- true }()
       handler(w, r)
     default:
       http.Error(w, "Too many connections", 429)
     }
   }
 }