HAProxy not load php file
I have a problem with Haproxy, I'm making 3 Google Cloud VPS to learn HAProxy.
1 vps for HAProxy using centos 7
The other 2 vps for website nodes use centos 7 too.
when the html folder on my website vps is filled with index.html the load balance runs smoothly,
but when i change the two vps node of this website to index.php access from ip loadbalance HAProxy 503 service is unavaiable. even though when I access the IP node, a normal website can run php files.