ERR_UNKNOWN_URL_SCHEME

ERR_UNKNOWN_URL_SCHEME Error

Category: Browser Errors | Platforms: chrome android ios

What This Error Means

The ERR_UNKNOWN_URL_SCHEME error occurs when the browser tries to navigate to a link with a protocol (scheme) that it does not recognize and has no application registered to handle. For example, clicking a link starting with `magnet:`, `steam:`, or `zoommtg:` when the corresponding application is not installed.

Common Causes

  • Clicking a deep link for an app that is not installed on your device.
  • Typo in the protocol section of the URL (e.g., `htpp://` instead of `http://`).
  • The operating system's file association for that protocol is broken or missing.
  • A website trying to launch an external app without checking if it is supported.

How to Fix It (For Users)

  1. 1 Install the application required to open the link (e.g., Zoom, Steam, a Torrent client).
  2. 2 Check the link for typos in the protocol (the part before the `://`).
  3. 3 If on mobile, ensure the app is installed and updated.
  4. 4 Manually select an application to open the link if prompted.

For Site Owners / Developers

  1. Ensure your deep links fallback gracefully to a web page if the app is not installed.
  2. Use standard protocols (HTTP/HTTPS) whenever possible.
  3. Validate user-generated links to prevent typos in protocols.
  4. Provide a clear 'Download App' button next to deep links.

When It Is NOT Your Fault

If the website assumes you have an app installed that you don't.

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