Go Chunks of Base64 Image

gistfile1.txt

image := make([]byte, asset.BlobInfo.Size)
	reader := blobstore.NewReader(ctx, asset.BlobInfo.BlobKey)
	reader.Read(image)
	
	imageAsBase64 := base64.StdEncoding.EncodeToString(image)
	
	megabyte := (500)
	
	totalSize := len(imageAsBase64)
	totalChunks := int(math.Ceil(float64(totalSize) / float64(megabyte)))
	chunks := make([]string, totalChunks)
	
	for i := 0; i < totalChunks; i++ {
		start := i * megabyte
		offset := (start + megabyte)
	
		if offset > totalSize {
			offset = totalSize
		}
	
		chunks[i] = imageAsBase64[start:offset]
	}
	
			for i, chunk := range chunks {
			go func(i int, chunk string) {

				chunkURL := fmt.Sprintf("%s/%s/Data/%d/.json?auth=%s", firebaseDataURL, share.FriendlyName, i, firebaseAuthKey)
				chunkReq, err := http.NewRequest("PUT", chunkURL, strings.NewReader("\""+chunk+"\""))
				if err != nil {
					//return err
				}

				chunkReq.Header.Set("Content-Type", "appliction/json")

				if _, err := client.Do(chunkReq); err != nil {
					//return err
				}
			}(i, chunk)
		}