Electron override headers

main.js

const { protocol, app, BrowserWindow } = require("electron");
const { readFileSync, statSync } = require("fs");
const mime = require("mime-types");

const createWindow = async () => {
  const win = new BrowserWindow({
    width: 1920,
    height: 1080,
    webPreferences: {
      webviewTag: true,
    },
  });

  protocol.handle("file", (request) => {
    const filePath = request.url.replace("file://", "");
    const response = readFileSync(filePath);
    const stat = statSync(filePath);

    const contentType = mime.lookup(filePath);

    const content = Buffer.from(response).toString("utf-8");

    return new Response(content, {
      headers: {
        "last-modified": stat.mtime.toUTCString(),
        "Content-Type": contentType,
        "Origin-Agent-Cluster": "?1",
      },
    });
  });

  win.loadFile("index.html");
};

app.whenReady().then(() => {
  createWindow();
});