Finally got time to test again. Thanks @MichelDiz !
I got the idea when I try solve another similar issue at “Failed to fetch” when add a localhost server in Dgraph Ratel Dashboard - #2 by Hongbo-Miao
In the end, I succeed
- Chrome 92.0.4515.107
- Firefox 92.0a1
and failed for
- Brave 1.29.16
- Safari 14.1.1
I guess Brave and Safari are expecting https.
Hope it can help some future people! 