Apache mod_proxy + mod_cache (socache y disco)

Question

Tengo aquí un clúster de equilibrio de carga apache mod_proxy de tres nodos. ahora quiero habilitar mod_cache para obtener más carga desde el backend hasta el frontend.

Esa es mi configuración para el caché:

<IfModule mod_cache.c>
    <IfModule mod_disk_cache.c>
            CacheDefaultExpire 3600
            CacheEnable disk https://
            CacheEnable disk /
            CacheRoot "/mnt/ram/"
            CacheDirLevels 2
            CacheDirLength 1
            CacheMaxFileSize 1000000
            CacheMinFileSize 1
            CacheIgnoreCacheControl On
            CacheIgnoreNoLastMod On
            CacheIgnoreQueryString Off
            CacheIgnoreHeaders None
            CacheLastModifiedFactor 0.1
            CacheDefaultExpire 3600
            CacheMaxExpire 86400
            CacheStoreNoStore On
            CacheStorePrivate On
    </IfModule>

módulos de apache cargados:

Loaded Modules:
 core_module (static)
 so_module (static)
 watchdog_module (static)
 http_module (static)
 log_config_module (static)
 logio_module (static)
 version_module (static)
 unixd_module (static)
 access_compat_module (shared)
 alias_module (shared)
 auth_basic_module (shared)
 authn_core_module (shared)
 authn_file_module (shared)
 authz_core_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 cache_module (shared)
 cache_disk_module (shared)
 cache_socache_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 fcgid_module (shared)
 filter_module (shared)
 headers_module (shared)
 lbmethod_bybusyness_module (shared)
 lbmethod_byrequests_module (shared)
 lbmethod_bytraffic_module (shared)
 mime_module (shared)
 mpm_event_module (shared)
 negotiation_module (shared)
 proxy_module (shared)
 proxy_balancer_module (shared)
 proxy_http_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 slotmem_shm_module (shared)
 socache_shmcb_module (shared)
 ssl_module (shared)
 status_module (shared)
 suexec_module (shared)

Entonces, el problema es que cualquier solicitud al sitio web también va al backend, por lo que no hay optimización del rendimiento.

¿Hay alguna manera de manejar esto con mod_cache?

Versión de Apache: 2.4.10 (Debian8) Backend: Sitio web Typo3.