vmod-saintmode: Allow using blacklist in vcl_backend_error #216
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In a way, this reverts 1.
Previously, we would prevent users from blacklisting a backend from vcl_backend_error. But this is actually useful to users: when a backend fails to respond (and is considered healthy due to e.g. a varnishadm call), we may want to blacklist it for a short while, in order to
return (retry)
and be sure that we do not use this backend for our second try.This changes the behavior to checking if there is an available backend, e.g. if we are in vcl_backend_response or vcl_backend_error.