Meaning
The upstream server returned an invalid response to the gateway.
Causes
- Upstream outage
- Invalid response format
- Network issues
Fixes
- Retry later
- Check the service status page
Example
HTTP/1.1 502 Bad Gateway
FAQ
- Is it a CDN issue?
Often happens at proxy/gateway layers. - What logs to check?
Inspect upstream server logs.
Contact
If it persists, contact the service owner.