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If you receive the 502 bad gateway status code, it means that the server is a gateway or a proxy server that is not receiving a valid response from the backend server(s) that serve the request.
Here are some things to check when encountering this error:
- The backend servers responsible for handling the requests are healthy.
- The proxy server is configured correctly.
- The network connection between the proxy server and backend servers is healthy.
- Check if the ports between the proxy server and the backend servers are not being blocked by the firewall.
RFC #: 7231 section 6.6.3
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