Trying to enable CORS on HAPROXY using lua but getting error

Help!
1

I’m trying to enable CORS on HAPROXY using the the lua library but getting the below warnings when I start the HAPROXY service which looks as if my CORS config rules will be ignored

Apr 21 14:13:16 haproxyobvtest haproxy[3697]: [NOTICE]   (3697) : path to executable is /usr/sbin/haproxy
Apr 21 14:13:16 haproxyobvtest haproxy[3697]: [WARNING]  (3697) : config : parsing [/etc/haproxy/haproxy.cfg:27] : 'option httplog' not usable with frontend 'LoadBalancer' (needs>
Apr 21 14:13:16 haproxyobvtest haproxy[3697]: [WARNING]  (3697) : config : 'http-request' rules ignored for frontend 'LoadBalancer' as they require HTTP mode.
Apr 21 14:13:16 haproxyobvtest haproxy[3697]: [WARNING]  (3697) : config : 'http-response' rules ignored for frontend 'LoadBalancer' as they require HTTP mode.
Apr 21 14:13:16 haproxyobvtest haproxy[3697]: [NOTICE]   (3697) : New worker (3699) forked
Apr 21 14:13:16 haproxyobvtest haproxy[3697]: [NOTICE]   (3697) : Loading success.
Apr 21 14:13:16 haproxyobvtest systemd[1]: Started HAProxy Load Balancer.

Below is my haproxy.cfg

global
    lua-load /etc/opt/rh/rh-haproxy18/haproxy/cors.lua
    log /dev/log    local0
    log /dev/log    local1 notice
    chroot /var/lib/haproxy
    stats socket /run/haproxy-admin.sock mode 660 level admin expose-fd listeners
    stats timeout 30s
    user haproxy
    group haproxy
    daemon

    # Default SSL material locations
    ca-base /etc/ssl/certs
    crt-base /etc/ssl/private

    # Default ciphers to use on SSL-enabled listening sockets.
    # For more information, see ciphers(1SSL). This list is from:
    #  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
    # An alternative list with additional directives can be obtained from
    #  https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy
    ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
    ssl-default-bind-options no-sslv3

defaults
    log global
    mode    http
    option  httplog
    option  dontlognull
    timeout connect 5000
    timeout client  50000
    timeout server  50000

frontend LoadBalancer
    bind *:443
    mode http
    default_backend backend_servers
    http-request lua.cors "GET,PUT,POST,OPTIONS" "*" "*"
    http-response lua.cors

backend backend_servers
    mode http
    balance roundrobin
    option tcpka
    option tcp-check

    server 172.18.18.132 172.18.18.132:31811 check
    server 172.18.18.133 172.18.18.133:31811 check
    server 172.18.18.134 172.18.18.134:31811 check
    server 172.18.18.135 172.18.18.135:31811 check
    server 172.18.18.136 172.18.18.136:31811 check
    server 172.18.18.137 172.18.18.137:31811 check
    server 172.18.18.138 172.18.18.138:31811 check
    server 172.18.18.139 172.18.18.139:31811 check
    server 172.18.18.140 172.18.18.140:31811 check
    server 172.18.18.141 172.18.18.141:31811 check

listen stats
    bind :9000 # Listen on localhost:9000
    mode http
    stats enable  # Enable stats page
    stats hide-version  # Hide HAProxy version
    stats realm Haproxy\ Statistics  # Title text for popup window
    stats uri /haproxy_stats  # Stats URI

My cors.lua file I just took from below gitrepo without editing