http-check comment <string>.

http-check connect [default] [port <expr>] [addr <ip>] [send-proxy] [via-socks4] [ssl] [sni <sni>] [alpn <alpn>] [linger] [proto <name>] [comment <msg>].

http-check disable-on-404.

http-check expect [min-recv <int>] [comment <msg>] [ok-status <st>] [error-status <st>] [tout-status <st>] [on-success <fmt>] [on-error <fmt>] [status-code <expr>] [!] <match> <pattern>.

http-check send [meth <method>] [{ uri <uri> | uri-lf <fmt> }>] [ver <version>] [hdr <name> <fmt>]* [{ body <string> | body-lf <fmt> }] [comment <msg>].

http-check send-state.