electron: Cannot load content on Windows when sandbox is enabled

This is killing me. I open a window and receive Error: ERR_FAILED (-2) loading ‘http://localhost:1800/something?key=val’ I made my code retry it, it then works and opens the URl in a window.

After that , net.request(…) also seems to be broken:

net::ERR_FAILED at SimpleURLLoaderWrapper.<anonymous> (electron/js2c/browser_init.js:105:6497) at SimpleURLLoaderWrapper.emit (events.js:315:20)

The URL that causes this error for me is valid when I paste it in a Browser directly.

Electron 11.1.1

Error occurring “electron”: “11.3.0”, on Windows 7 32bit. But it’s not persistent. Also 64bit version is OK. I didn’t tried other on OSs.

But it’s not persistent. Just sometimes open app is fail and got this error.

Error: ERR_FAILED (-2) loading ‘app://./’

Any help?

Update to the above: loading https://google.com is instant and seems to never fail, same for github and main google docs page. So I’d assume it has something to do with load timeouts, or the fact there is a URL passed as a URL parameter.

Uncaught (in promise) Error: ERR_FAILED (-2) loading 'https://docs.google.com/gview?url=https://calibre-ebook.com/downloads/demos/demo.docx'
    at rejectAndCleanup (:8080/electron/js2c/browser_init.js:217)
    at Object.stopLoadingListener (:8080/electron/js2c/browser_init.js:217)
    at Object.emit (events.js:327)

This happens on our Linux (5.10 - 5.15) machines randomly. Most of the time it loads successfully, but once in a while it fails.

package.json:

        "electron": "^12.0.1",
        "electron-devtools-installer": "^3.1.0",
        "electron-updater": "^4.3.8",

background.js:

    win = new BrowserWindow({
        width: 800,
        height: 600,
        minWidth: 800,
        minHeight: 600,
        webPreferences: {
            nodeIntegration: process.env.ELECTRON_NODE_INTEGRATION,
            devTools: isDevelopment,
            enableRemoteModule: true,
            contextIsolation: false,
            webSecurity: false
        },
        frame: false,
        backgroundColor: '#FFF'
    });
    win.webContents.setWindowOpenHandler(() => {
        return {
            action: 'allow',
            overrideBrowserWindowOptions: {
                webPreferences: {
                    nativeWindowOpen: true
                }
            }
        };
    });

The code:

  const { BrowserWindow } = require('electron').remote;

  const win = new BrowserWindow({ width: 800, height: 600 });
  win.loadURL(
      'https://docs.google.com/gview?url=https://calibre-ebook.com/downloads/demos/demo.docx'
  );
  win.webContents.openDevTools();

I found a nasty hack that solved the problem for us. At one point I noticed that resizing the window forced the app to load the html file, and with that, the app UI.

Then I started adding 1px to the app’s width when creating the window:

const win = new BrowserWindow({
    width: APP_WIDTH + 1,
    show: false,
    ...
});

and then setting the correct width when the window is ready to show:

win.once('ready-to-show', () => {
    win.show();
    win.setBounds({ width: APP_WIDTH });
});

I know it doesn’t look good, but it worked.

I am seeing this too, OSX works just fine - windows is the issue.