Why not setkeepalive on tcp socket ?

[NicoAdrian]

For each healthcheck, you seem to close the socket, why not put it into the connection pool with sock:setkeepalive() instead ?

https://github.com/openresty/lua-resty-upstream-healthcheck/blob/346f3a642b6717a26382e4032160aa766af0188c/lib/resty/upstream/healthcheck.lua#L275

[zhuizhuhaomeng]

the healthcheck.lua does not parse the full http response, maybe there are some data left in the socket. So we can not put it into the pool