502
Bad Gateway
Server errors (5xx)·RFC 9110
What 502 means
A server acting as a gateway received an invalid response from an upstream server.
Common behind reverse proxies and load balancers when the backend is down, crashed or returning garbage.
Server errors (5xx)
The server failed to fulfil an apparently valid request.
Other 5xx codes
FAQ — 502
What does HTTP 502 mean?
502 Bad Gateway: A server acting as a gateway received an invalid response from an upstream server. Common behind reverse proxies and load balancers when the backend is down, crashed or returning garbage.
Which class does status code 502 belong to?
502 is a Server errors (5xx) code. The server failed to fulfil an apparently valid request.
Where is the 502 code defined?
Status code 502 is defined in RFC 9110 and is part of the IANA HTTP Status Code Registry.