502
Bad Gateway
5xx · Server Error
The server received an invalid response from an upstream server.
What does HTTP 502 Bad Gateway mean?
A server acting as a gateway or proxy received an invalid response from an upstream server. It usually points to a problem between servers rather than the client.
5xx responses indicate the server failed to fulfil a valid request. The problem is on the server side and is not something the client can fix by changing the request.
Common causes
- The upstream/origin server is down or crashing
- Misconfigured reverse proxy or load balancer
- Firewall blocking the upstream response
How to fix a 502 error
- Check that the origin server is running and healthy
- Verify proxy/load-balancer upstream configuration
- Inspect upstream timeouts and error logs
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