How to pipe an HTTP response to a file in Go?

How about io.Copy()? Its documentation can be found at: http://golang.org/pkg/io/#Copy

It’s pretty simple, though. Give it an io.Reader and an io.Writer and it copies the data over, one small chunk at a time (e.g. not all in memory at once).

So you might try writing something like:

func main() {
  resp, err := http.Get("...")
  check(err)
  defer resp.Body.Close()
  out, err := os.Create("filename.ext")
  if err != nil {
    // panic?
  }
  defer out.Close()
  io.Copy(out, resp.Body)
}

I haven’t tested the above; I just hacked it together quickly from your above example, but it should be close if not on the money.