Hi PPPHealth,
we are aware that some customers are encountering 504 errors when accessing API documentation pages on our website while logged in, and we are continuing to investigate the issue under ticket INC0404780.
In the meantime, a workaround is to access those pages while logged out, as well as refreshing the page a few times.
We apologize for the inconvenience and I will provide updates as soon as I have them.
Many thanks,
The Developer Portal team