如何使用Go语言下载带有HTTP请求的文件

Question

I want to download a file from an url in go lang using the go http package and save the image to disk for later display on my webpage. How do I do this?

I need to do this because I want to download images from instagram and save them to my public folder for display on my webpage.

I created an answer below for others to use the code I came up with.

Answer 1

After some research I came up with this.

import (
    "os"
    "net/http"
    "io"
)

func downloadFile(filepath string, url string) (err error) {

  // Create the file
  out, err := os.Create(filepath)
  if err != nil  {
    return err
  }
  defer out.Close()

  // Get the data
  resp, err := http.Get(url)
  if err != nil {
    return err
  }
  defer resp.Body.Close()

  // Writer the body to file
  _, err = io.Copy(out, resp.Body)
  if err != nil  {
    return err
  }

  return nil
}

It works well but might need a bit of refinement for use in production.