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Golang io.copy not copying entire data

Asked By: Anonymous

I have small code which reads 100 MB file from Google cloud storage and then return output.

Code works fine for 1MB file but fails for 100 mb file.

Below is the code which is not working

rc, err := client.Bucket("mabucket").Object(gcpurl).NewReader(ctx)
    if err != nil {

    defer rc.Close()

    w.Header().Set("Content-Length", strconv.Itoa(int(rc.Size())))
    w.Header().Set("Cache-Control", "max-age=2592000")
    w.Header().Set("Content-Type", rc.ContentType())


    if rc.ContentType() == "audio/wav" || rc.ContentType() == "audio/wave" {
        w.Header().Set("Accept-Ranges", "bytes")

        tilrange := rc.Size() - 1
        newRangeString := "bytes 0-" + strconv.Itoa(int(tilrange)) + "/" + strconv.Itoa(int(rc.Size()))
        w.Header().Set("Content-Range", newRangeString)



    io.Copy(w, rc)

I have written another code which is able to download same file and create a local file of 100 mb.
this time I am using ioutil.ReadAll. what can be problem with io.copy when receiving large date from GCP?

func main() {

    ctx := context.Background()
    client, _ := storage.NewClient(ctx)

    data, err := downloadFile(client, "mabucket", "606ff2b71a916907409a953f/606ff2ed1a916907409a9540/60a38a967b291f7b44488824/123/audio/210415164000M29713363.wav")

    if err != nil {
        log.Fatalf("Cannot read object: %v", err)

    fmt.Printf("Object contents: %dn", len(data))

    f, err := os.Create("a.wav")
    defer f.Close()

    n2, err := f.Write(data)
    fmt.Printf("wrote %d bytesn", n2)

// downloadFile downloads an object.
func downloadFile(client *storage.Client, bucket, object string) ([]byte, error) {
    // [START download_file]
    ctx := context.Background()

    ctx, cancel := context.WithTimeout(ctx, time.Second*50)
    defer cancel()
    rc, err := client.Bucket(bucket).Object(object).NewReader(ctx)
    if err != nil {
        return nil, err
    defer rc.Close()

    data, err := ioutil.ReadAll(rc)
    if err != nil {
        return nil, err
    return data, nil
    // [END download_file]


Answered By: Anonymous

io.copy was trying to copy the details but OS was not allowing it. it was throwing error as (*net.OpError)(0xc0003302d0)(write tcp [::1]:80->[::1]:63014: wsasend: An established connection was aborted by the software in your host machine

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