Add support of load balancing (multiple backends)

[Koc]

Add support of load balancing (multiple backends)

[TXMuc]

If you don't use php-fpm, i might have a solution:
https://github.com/TXMuc/ApcBundle

I added a config parameter 'ip':

  #app/config/config.yml
  ornicar_apc:
      host: yourhost.tld
      ...
      mode: curl
      ip: 127.0.0.1

If the ip parameter is set and curl is used, the http request is sent to the configured IP address (localhost!) with Host:yourhost.tld in the HTTP header.
This should work on any servers behind the load balancer.