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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