Documentation for 5.2 on https://confluence.ez.no/display/EZP/Virtual+host+example

httpd.conf

 <VirtualHost 128.39.140.28>
     <Directory /var/www/example/web>
         Options FollowSymLinks
         AllowOverride None
     </Directory>
  
     <IfModule mod_php5.c>
         php_admin_flag safe_mode Off
         php_admin_value register_globals    0
         php_value magic_quotes_gpc  0
         php_value magic_quotes_runtime  0
         php_value allow_call_time_pass_reference 0
     </IfModule>
  
     DirectoryIndex index.php
+
+    # Environment.
+    # Possible values: "prod", "dev", "staging",...
+    # Defaults to "prod" if omitted
+    SetEnv ENVIRONMENT "prod"
+
+    # Whether to use Symfony's ApcClassLoader.
+    # Possible values: 0 or 1
+    # Defaults to 0 if omitted
+    #SetEnv USE_APC_CLASSLOADER 0
+
+    # Prefix used when USE_APC_CLASSLOADER is set to 1.
+    # Use a unique prefix in order to prevent cache key conflicts
+    # with other applications also using APC.
+    # Defaults to "ezpublish" if omitted
+    #SetEnv APC_CLASSLOADER_PREFIX "ezpublish"
+
+    # Whether to use debugging.
+    # Possible values: 0 or 1
+    # Defaults to 0 if omitted, unless ENVIRONMENT is set to: "dev"
+    #SetEnv USE_DEBUGGING 0
+
+    # Whether to use Symfony's HTTP Caching.
+    # Disable it if you are using an external reverse proxy (e.g. Varnish)
+    # Possible values: 0 or 1
+    # Defaults to 1 if omitted, unless ENVIRONMENT is set to: "dev"
+    #SetEnv USE_HTTP_CACHE 1
+
+    # Defines the proxies to trust.
+    # Separate entries by a comma
+    # Example: "proxy1.example.com,proxy2.example.org"
+    # By default, no trusted proxies are set
+    #SetEnv TRUSTED_PROXIES "127.0.0.1"
  
     <IfModule mod_rewrite.c>
         RewriteEngine On
  
         # CVE-2012-6432
         RewriteRule ^/_internal - [R=403,L]
  
         # Uncomment in FastCGI mode, to get basic auth working.
         #RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
         # v1 rest API is on Legacy
         RewriteRule ^/api/[^/]+/v1/ /index_rest.php [L]
  
         # If using cluster, uncomment the following two lines:
         #RewriteRule ^/var/([^/]+/)?storage/images(-versioned)?/.* /index_cluster.php [L]
         #RewriteRule ^/var/([^/]+/)?cache/(texttoimage|public)/.* /index_cluster.php [L]