electron_bug.webRequest.onBeforeSendHeaders.js

const {app, BrowserWindow} = require('electron')
app.once('ready', async () => {
  win = new BrowserWindow()
  win.webContents.session.webRequest.onBeforeSendHeaders((details, callback) => callback({}));
  win.webContents.once('did-finish-load', async () => {
    const html = await win.webContents.executeJavaScript('document.documentElement.innerHTML');
    console.log(html);
    app.quit()
  })
  await win.webContents.loadURL('https://httpbin.org/headers', {"extraHeaders":"Addition-Header: hello world"})
})