Checklist

• This is a bug report, not a question. Ask questions on discuss.ipfs.io.
• I have searched on the issue tracker for my bug.
• I am running the latest kubo version or have an issue updating.

Installation method

built from source

Version

0.21.0-rc3

Config

default after `ipfs init`

Description

We seem to have regression since Kubo 0.20.0, webui is unable to fetch blocks from gateway port due to CORS:

Occuring during subdomain redirect (localhost):

For TLDR of potential cause see #9983 (comment)

cc #9814, as we don't want to introduce this regression in 0.21