Relative paths are tricky to get right on IPFS gateway.
To remove the most common pitfail, go-ipfs returns HTTP 302 redirect when the root directory is requested without trailing slash and adds it automatically:
$ curl -I https://ipfs.io/ipfs/QmaXPQ28xM7h8AjnbJ8cD6Ux4mgvqtwGRYjgsxEPQ6kJTX HTTP/2 302 ... location: /ipfs/QmaXPQ28xM7h8AjnbJ8cD6Ux4mgvqtwGRYjgsxEPQ6kJTX/
Unfortunately Infura disabled this behavior and returns HTML immediately for URLs without trailing slash:
This is error prone, moves the base URL from
/ipfs/, breaking relative paths as described here.
Restoring the redirect should fix all websites with relative paths.