Try using os.Open to get a *File (which implements io.Reader), and then
io.Copy to the response from the file.
On Tuesday, February 28, 2017 at 5:13:20 AM UTC-6, Jeffrey Smith wrote:
>
> I'm trying to server up a file that can be very large so would like to try
> and stream the content back.
>
> package main
>
> import (
> "bytes"
> "fmt"
> //"io"
> "io/ioutil"
> "log"
> "net/http"
> )
>
> func main() {
>
> http.HandleFunc("/", serverFile)
> if err := http.ListenAndServe(":8085", nil); err != nil {
> log.Fatal(err)
> }
>
> }
>
> func serverFile(w http.ResponseWriter, r *http.Request) {
>
> streamPDFbytes, err := ioutil.ReadFile("./large.txt")
> if err != nil {
> fmt.Println(err)
> return
> }
>
> b := bytes.NewBuffer(streamPDFbytes)
>
> w.Header().Set("Content-Disposition",
> "attachment;filename=large.txt")
> //io.Copy(w, b)
> if _, err := b.WriteTo(w); err != nil {
> fmt.Fprintf(w, "%s", err)
> }
> }
>
> I tried using this but I believe ioutil.readFile actually calls
> ioutil.readAll so sticks the whole content of the file into a byte array.
> What am i doing wrong?
>
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