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

go

Solution

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.

Problem

How do I convert the below code to use streams/pipes so that I don't need to read the full content into memory? Something like: `http.Get("http://example.com/").Pipe("./data.txt")` ``` package main import ("net/http";"io/ioutil") func main() { resp, err := http.Get("http://example.com/") check(err) defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body) check(err) err = ioutil.WriteFile("./data.txt", body, 0666) check(err) } func check(e error) { if e != nil { panic(e) } } ```

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