title: Go client program generates a lot a sockets in TIME_WAIT state
body: <p>I have a Go program that generates a lot of HTTP requests from multiple goroutines.  after running for a while, the program spits out an error: connect: cannot assign requested address.</p>
  
  <p>When checking with <code>netstat</code>, I get a high number (28229) of connections in <code>TIME_WAIT</code>.</p>
  
  <p>The high number of <code>TIME_WAIT</code> sockets happens when I the number of goroutines is 3 and is severe enough to cause a crash when it is 5.</p>
  
  <p>I run Ubuntu 14.4 under docker and go version 1.7</p>
  
  <p>This is the Go program.</p>
  
  <pre><code>package main
  
  import (
          "io/ioutil"
          "log"
          "net/http"
          "sync"
  )
  var wg sync.WaitGroup
  var url="http://172.17.0.9:3000/";
  const num_coroutines=5;
  const num_request_per_coroutine=100000
  func get_page(){
          response, err := http.Get(url)
          if err != nil {
                  log.Fatal(err)
          } else {
                  defer response.Body.Close()
                  _, err =ioutil.ReadAll(response.Body)
                  if err != nil {
                          log.Fatal(err)
                  }
          }
  
  }
  func get_pages(){
          defer wg.Done()
          for i := 0; i &lt; num_request_per_coroutine; i++{
                  get_page();
          }
  }
  
  func main() {
          for i:=0;i&lt;num_coroutines;i++{
                  wg.Add(1)
                  go get_pages()
          }
          wg.Wait()
  }
  </code></pre>
  
  <p>This is the server program:</p>
  
  <pre><code>package main
  
  import (
      "fmt"
      "net/http"
      "log"
  )
  var count int;
  func sayhelloName(w http.ResponseWriter, r *http.Request) {
      count++;
      fmt.Fprintf(w,"Hello World, count is %d",count) // send data to client side
  }
  
  func main() {
      http.HandleFunc("/", sayhelloName) // set router
      err := http.ListenAndServe(":3000", nil) // set listen port
      if err != nil {
          log.Fatal("ListenAndServe: ", err)
      }
  }
  </code></pre>