[Bug]: Using net.fetch with bypassCustomProtocolHandlers fails to load local mp4 files

[BrandonXLF]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

27.0.3

What operating system are you using?

Windows

Operating System Version

Windows 11 22H2

What arch are you using?

x64

Last Known Working Electron version

No response

Expected Behavior

The mp4 file should load just as it would without the protocol handle set.mp4

Actual Behavior

The document for the mp4 files loads but the video itself does not.

Testcase Gist URL

https://gist.github.com/BrandonXLF/465e91ee96fe29514d4e9d998e590d76

Additional Information

No response

[electron-issue-triage]

This issue has been automatically marked as stale. If this issue is still affecting you, please leave any comment (for example, "bump"), and we'll keep it open. If you have any new additional information—in particular, if this is still reproducible in the latest version of Electron or in the beta—please include it with your comment!

[BrandonXLF]

Reproducible in v29.1.0

[wangf1978]

same issue with me

[liuxini]

same issue with me

[Matt95]

I am getting the same issue even with bypassCustomProtocolHandlers: false

[Matt95]

I am getting the same issue even with bypassCustomProtocolHandlers: false

Resolved, adding stream privilege on the protocol was required for correctly loading mp4 file types:

protocol.registerSchemesAsPrivileged([
     {
       scheme: 'scheme-name',
       privileges: {
         stream: true,
       }
     }
  ])