HTTP uses the GET method to download files

The essence of HTTP download file is to get the response data in the response body and write it to the file. The second way is to implement a real-time display of download progress function

package main import ( "fmt" "io" "net/http" "os" ) func downloadFile(url, fileName string) { resp, err := http.Get(url) if err ! = nil { panic(err) } defer func() {_ = resp.Body.Close()}() file, err := os.Create(fileName) if err ! = nil { panic(err) } defer file.Close() n, err := io.Copy(file, resp.Body) fmt.Println(n, err) } type Reader struct { io.Reader Total int64 Currnet int64 } func (r *Reader) Read(p []byte) (n int, err error) { n, err = r.Reader.Read(p) r.Currnet += int64(n) fmt.Printf("\r %.2f%%", float64(r.Currnet * 10000 / r.Total) / 100) return } func DownloadFileProgress(url, fileName string){ resp, err := http.Get(url) if err ! = nil { panic(err) } defer func() {_ = resp.Body.Close()}() file, err := os.Create(fileName) if err ! = nil { panic(err) } defer file.Close() reader := &Reader{ Reader: resp.Body, Total: resp.ContentLength, } io.Copy(file, Reader)} func main () {/ / download file url: url = "https://i1.hdslb.com/bfs/face/0d2f52b9e1dae83b2cd710b38ee911533db32774.jpg" // DownloadFile (url, fileName) DownloadFileProgress(url, fileName)}