- Electron version: 1.2.1
- Operating system: Mac OS X

See also https://github.com/electron/electron/issues/5714

STR:
1. Start a webserver on localhost:port that serves a dummy index.html
2. Register a custom http protocol.
   
   ``` js
   electron.protocol.registerStandardSchemes(['foobar', 'http', 'https']);
   
   app.on('ready', function() {
     electron.protocol.registerHttpProtocol('foobar', (request, callback) => {
       const redirectPath = `http://localhost:port/index.html`;
       callback({ method: request.method, referrer: request.referrer, url: redirectPath });
     }, e => { if (e) { console.log(e); } });
   });
   ```
3. Either through devtools, or via some js in our index.html, have a single line that does `fetch('http://localhost:port/index.html')` or anything else from our server.

Results: as soon as `fetch` is called, the webview becomes black, and the devtools crash if they were open. No other visible error or stdout.

If devtools were open, they show this message: "Devtools was disconnected from the page.
Once page is reloaded, DevTools will automatically reconnect."

atom/browser/api/atom_api_protocol.cc
const std::vector<std::string>& schemes) {
  for (const auto& scheme : schemes)
    url::AddStandardScheme(scheme.c_str(), url::SCHEME_WITHOUT_PORT);
}
mate::Handle<atom::api::Protocol> CreateProtocol(v8::Isolate* isolate) {
  auto browser_context = static_cast<atom::AtomBrowserContext*>(
      atom::AtomBrowserMainParts::Get()->browser_context());
  return atom::api::Protocol::Create(isolate, browser_context);
}
void Initialize(v8::Local<v8::Object> exports, v8::Local<v8::Value> unused,
                v8::Local<v8::Context> context, void* priv) {
  v8::Isolate* isolate = context->GetIsolate();
  mate::Dictionary dict(isolate, exports);
  dict.SetMethod("createProtocolObject", base::Bind(&CreateProtocol, isolate));
  dict.SetMethod("registerStandardSchemes", &RegisterStandardSchemes);
}
}  
NODE_MODULE_CONTEXT_AWARE_BUILTIN(atom_browser_protocol, Initialize)