Downloading a file over HTTP

A common task in modern computing is downloading a file over the HTTP protocol. The following example shows how to quickly download a specific URL to a file.

Other common tools that accomplish this task are curl and wget:

package main 
 
import ( 
   "io" 
   "log" 
   "net/http" 
   "os" 
) 
 
func main() { 
   // Create output file 
   newFile, err := os.Create("devdungeon.html") 
   if err != nil { 
      log.Fatal(err) 
   } 
   defer newFile.Close() 
 
   // HTTP GET request devdungeon.com 
   url := "http://www.devdungeon.com/archive" 
   response, err := http.Get(url) 
   defer response.Body.Close() 
 
   // Write bytes from HTTP response to file. 
   // response.Body satisfies the reader interface. 
   // newFile satisfies the writer interface. 
   // That allows us to use io.Copy...