membphis commented on issue #3342:
URL: https://github.com/apache/apisix/issues/3342#issuecomment-763501279
`502` means the upstream is running but cannot respond to requests normally
`503` means the upstream can not working (stoped or restarting)
so I think we should use `503` if
membphis commented on issue #3342:
URL: https://github.com/apache/apisix/issues/3342#issuecomment-763495078
> Maybe we can ignore the failed DNS response?
agree, and need to write an error log for this case.
if there is no healthy node, we should return `503` for this case.
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