[go-nuts] Re: Serve large files

[Tamás Gulácsi]

A  "defer streamPDFbytes.Close()" is missing - you'll run out of file 
descriptors...

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[go-nuts] Re: Serve large files

[Christian Joergensen]

Hello,

I'd recommend you take a look at:
https://godoc.org/net/http#ServeFile

This also gives you support for range requests and other goodies.

Cheers,

Christian

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Re: [go-nuts] Re: Serve large files

[Jesse McNelis]

Try using os.Open to get a *File (which implements io.Reader), and then
> io.Copy to the response from the file.
>

You should use https://golang.org/pkg/net/http/#ServeFile that's what it
does. It will also handle requests with range headers for allowing the
client to fetch just a part of the file.

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[go-nuts] Re: Serve large files

[Jordan Krage]

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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