Reminder for setting proxy in docker daemon service; sandbox; 502 badgateway;

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if you encountered Error: Failed to execute code, got status code 502, please check if the sandbox service is running even after you checked sandbox service health, please check proxy settings for docker daemon.
This will result the api container using the configured proxy to communicate with sandbox container, and due to network address issue the request will fail.
To test if this is the situation:
in docker-compose.yaml, find services - api - environment, append these lines

      http_proxy: ""
      https_proxy: ""
      HTTP_PROXY: ""
      HTTPS_PROXY: ""

then docker compose down && docker compose up -d, try again to see if you still encounter this error.
I see some people encountered the same issue like me but the original issue is locked so I can't answer them there.