TypeError:Failed to fetch

[Tluche]

hello, i'm on Fedora 40 , i really like Vivaldi browser and would love to use it as GUI for Comfyui ( IA image generative software) as i do with Chrome , thing is when i want to Click and Drop an image from a Nautilus page to my Vivaldi window which is running ComfyUI on a Load Image Node i'm always facing this error which make Vivaldi difficult to use !
Any help will be greatly appreciated...

[DoctorG]

@Tluche Welcome in our Vivaldi Community

Some useful links for you:

• New to the Forum? Start here!
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Enjoy browsing with Vivaldi.

[DoctorG]

@Tluche As i do not have your JavaScript/local server environment, i can not test.

When you drag the image to Vivaldi, tell what errors appear in Devtools (see Tools → Developer Tools → Console)?

[Tluche]

Hello, Is it what you asked for ?

[DoctorG]

@Tluche Seems your server dos not work with HTTP/2 or Quic protocol. I co not know, why.
Perhaps a security tool (firewall, antivirus) on your system?

And, please, check internal page vivaldi://flags and reset them.

[Tluche]

hello no firewall or antivirus and it does work with Chrome on the same system , just prefer Vivaldi , i did reset all flags but still the same .
i faced the same pb 2 months ago that'as why i gave up on Vivaldi even if i prefer it to Chrome

[DoctorG]

@Tluche Perhaps this might help:

• Insecure origins treated as secure
  Open vivaldi://flags/#unsafely-treat-insecure-origin-as-secure
  Add http://127.0.0.1/ in text field
  Set to Enabled at right
  Close internal page
• Allow invalid certificates for resources loaded from localhost.
  Open vivaldi://flags/#allow-insecure-localhost
  Set to Enabled
  Close internal page
• Restart Vivaldi
• on 127.0.0.1 page disable Vivaldi Blocker (click shield in address field)
• Force reload of page you use with Ctrl+Shift+R

[Tluche]

Did everything but still same error , thanks a lot for your reactivity and concern

[DoctorG]

@Tluche looking at your posted screenshot, i think the upload API does only work with HTTPS (SSL) or your configuration for the API server is wrong.
You have sent a POST http://127.0.0.1:8188/api/upload/image
and the server replies need of HTTP/2 or Quic protocol.