package main

   import (

           "fmt"

           "net"

           "net/http"

   )

   func main() {

          client := &http.Client{}

          _, err := client.Get("http://lsjkgj/kllsjkljg/jljsdglk")

          fmt.Println(err.Error())

          if oe, ok := err.(net.Error); ok {

                  if oe.Timeout() {

                          fmt.Println("timeout")

                  }

          } else {

                  fmt.Println("error")

          }

  }

Get http://lsjkgj/kllsjkljg/jljsdglk: dial tcp: i/o timeout

timeout