electron: registerURLSchemeAsPrivileged does not allow service worker to use file:// scheme

Electron version: 1.6.10 ia32
Operating system: windows 7 x64

Expected behavior

create-react-app comes with a service worker by default that uses the fetch API to cache and load resources. I’m expecting webFrame.registerURLSchemeAsPrivileged('file'); to allow the fetch to load with the file scheme.

Actual behavior

When fetch is used inside of Electron from the service worker the original error is:

Fetch API cannot load file://.... URL scheme "file" is not supported"

According to, https://github.com/electron/electron/issues/2831 https://github.com/electron/electron/issues/9474

“You can add fetch support to file scheme in your app by using webFrame.registerURLSchemeAsPrivileged api.”

So I attempted webFrame.registerURLSchemeAsPrivileged('file');

Which changes the error to:

Uncaught (in promise) TypeError: Request scheme 'file' is unsupported at service-worker.js:1

About this issue

Original URL
State: closed
Created 7 years ago
Reactions: 15
Comments: 27 (5 by maintainers)

Commits related to this issue

Fix: Register File URL Scheme as Priviledged Adding `webFrame.registerURLSchemeAsPrivileged('file');` to the Electron render process is the sanctioned solution to fix `Fetch API cannot load... URL sc... — committed to nCoda/julius by siennamw 7 years ago
Fix: Register File URL Scheme as Priviledged Adding `webFrame.registerURLSchemeAsPrivileged('file');` to the Electron render process is the sanctioned solution to fix `Fetch API cannot load... URL sc... — committed to nCoda/julius by siennamw 7 years ago
Deregistering serviceWorkers - https://github.com/electron/electron/issues/9705 — committed to zenjara/myExpenses by korac 6 years ago

Most upvoted comments

+1 electron v7.1.14

whitemiaool on Mar 3, 2020

This issue persists in the latest electron versions. Other important Service Worker APIs appear to have not worked for years, too, such as Background Sync.

WesWedding on Dec 19, 2019

Electron: 2.0.0 Windows 10 64-bits Pro @codebytere @deepak1556 Could the blocked label be removed? There’s a reproducible git repo up here in the comments

DalderupMaurice on Jun 9, 2018

Electron: 2.0.5 Windows 10 Pro

After spending all evening looking at around posts, trying as many different hacky things as I can, I’ve come to realise that I’m suffering from the same problem in #13740 as is reported in here - the CRA service worker uses fetch(), which is throwing up the error mentioned at the beginning of this issue:

Uncaught (in promise) TypeError: Request scheme 'file' is unsupported at service-worker.js:1

I am unsure if it’s possible to run the latest React without the service workers, but I’m guessing this issue will affect all React applications trying to run in Electron @codebytere ?

alvaromarithompson on Jul 19, 2018

Any updates on this one? @pfrazee has a reproducible test case:

git clone https://github.com/pfrazee/electron-bug-service-workers-failure
cd electron-bug-service-workers-failure
npm i
npm start

from https://github.com/electron/electron/issues/9663

So can we remove the blocked tag on this issue?

leshow on May 31, 2018

@codebytere I just checked my test case for https://github.com/electron/electron/issues/9663 and it’s still failing

pfrazee on May 18, 2018

electron: 1.7.8 mac: macOS Sierra 10.12.6

rafalradomski on Oct 4, 2017

same for:

Electron version: 1.6.8
Operating system: macox 10.11.6

marcusdb on Jun 9, 2017