Как через websocket отправить файл на golang?

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package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
}

func handleWebSocket(w http.ResponseWriter, r *http.Request) {
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println("Failed to upgrade WebSocket connection:", err)
		return
	}
	defer conn.Close()

	for {
		messageType, message, err := conn.ReadMessage()
		if err != nil {
			log.Println("Error while reading message from WebSocket:", err)
			break
		}

		if messageType == websocket.BinaryMessage {
			// Сохраните полученный файл
			err := ioutil.WriteFile("file.jpg", message, os.ModePerm)
			if err != nil {
				log.Println("Failed to write file:", err)
				return
			}

			log.Println("File saved successfully.")
			break
		}
	}
}

func main() {
	http.HandleFunc("/ws", handleWebSocket)

	log.Println("Server started on http://localhost:8000")
	log.Fatal(http.ListenAndServe(":8000", nil))
}

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var socket = new WebSocket("ws://localhost:8000/ws");

var fileInput = document.getElementById('fileInput');
fileInput.addEventListener('change', function(event) {
  var file = fileInput.files[0];
  socket.send(file);
});