Works perfectly. cheers
package main
import (
"fmt"
"io"
"log"
"net/http"
"os"
)
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 := os.Open("./large.txt")
if err != nil {
fmt.Println(err)
return
}
w.Header().Set("Content-Disposition",
"attachment;filename=large.txt")
io.Copy(w, streamPDFbytes)
}
On Tuesday, February 28, 2017 at 11:34:04 AM UTC, Jordan Krage wrote:
>
> 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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