504 Gateway Timeout
A gateway or proxy did not receive a timely response from the upstream server it needed to complete the request.
5xx · Server error
Typical causes
Slow handlers, a blocked or unreachable database or API, or requests that run longer than the proxy's timeout.
On Bex
On Bex, look for slow handlers and blocked dependencies in the runtime logs and metrics; a health check that times out points at the same causes.
Read the Bex guideDefined in RFC 9110, §15.6.5