I'm having the same issue 521 error with Refused to display 'https://text-generation.perchance.org/' in a frame because it set 'X-Frame-Options' to 'sameorigin'., tried multiple browsers and devices with alternate internet connections.
Trying to navigate to text-generation.perchance.org shows server down (521 or any 500 error is a server error).
Appears to be back up and running.