Does any module support the heathy check of the backend upstreams?

[Chieu]

hi,
I want to implement a module that can check the heathy of the backend web
servers circlely. If the upstream died, the module can remove the server
from the upstream list and if the upstream get up, the module can add  it to
the list.
Is there a good way to implement it?

thank you
Chieu
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