first import

sites/all/modules/variable/variable_advanced/variable_advanced.info

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+name = Variable advanced
+description = Provides access to advanced low level variables. By using this you will be able to break your site badly.
+dependencies[] = variable
+package = Variable
+core = 7.x
+; Information added by drupal.org packaging script on 2013-01-13
+version = "7.x-2.2"
+core = "7.x"
+project = "variable"
+datestamp = "1358075138"
+

sites/all/modules/variable/variable_advanced/variable_advanced.module

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+<?php
+/**
+ * @file
+ * Drupal module - Advanced variable otpions.
+ */

sites/all/modules/variable/variable_advanced/variable_advanced.variable.inc

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+<?php
+/**
+ * @file
+ * Advanced variables.
+ */
+
+/**
+ * Implements hook_variable_group_info().
+ */
+function variable_advanced_variable_group_info() {
+  $groups['advanced'] = array(
+    'title' => t('Advanced options'),
+    'description' => t('Advanced settings not usually exposed. Changing these variables may seriously break your site so make sure you know what you do.'),
+  );
+  return $groups;
+}
+
+/**
+ * Implements hook_variable_info().
+ */
+function variable_advanced_variable_info($options) {
+  // Bootstrap caching options
+  $variables['page_cache_invoke_hooks'] = array(
+    'title' => t('Cache invoke hooks'),
+    'type' => 'enable',
+    'default' => 1,
+    'group' => 'advanced',
+    'description' => T('Invoke <em>boot</em> and <em>exit</em> hooks when the page is served from cache.'),
+  );
+  $variables['actions_max_stack'] = array(
+    'title' => t('Actions recursion level'),
+    'type' => 'number',
+    'default' => 35,
+    'group' => 'advanced',
+    'description' => t('Maximum recursion level for actions before the execution is aborted.', array(), $options),
+  ); 
+  // Bootstrap language variables.
+  $variables['language_count'] = array(
+    'title' => t('Language count'),
+    'type' => 'number',
+    'default' => 1,
+    'group' => 'advanced',
+    'description' => t('Number of enabled languages, used for quick bootstrap. Not to be changed manually.', array(), $options),
+  );
+  $variables['language_types'] = array(
+    'title' => t('Language types'),
+    'type' => 'array',
+    'default callback' => 'drupal_language_types',
+    'group' => 'advanced',
+    'description' => t('Available language types.'),
+  );  
+  // Bootstrap proxy configuration
+  $variables['reverse_proxy'] = array(
+    'title' => t('Reverse proxy'),
+    'type' => 'enable',
+    'default' => 0,
+    'group' => 'advanced',
+    'description' => t('If Drupal is behind a reverse proxy, we use the X-Forwarded-For header instead of $_SERVER[\'REMOTE_ADDR\'], which would be the IP address of the proxy server, and not the client\'s. The actual header name can be configured by the reverse_proxy_header variable.', array(), $options),
+  );
+  $variables['reverse_proxy_header'] = array(
+    'title' => t('Reverse proxy header'),
+    'default' => 'HTTP_X_FORWARDED_FOR',
+    'group' => 'advanced',
+  );
+  $variables['reverse_proxy_addresses'] = array(
+    'title' => t('Reverse proxy addresses'),
+    'type' => 'array',
+    'group' => 'advanced',
+    'default' => array(),
+    'description' => t('If an array of known reverse proxy IPs is provided, then trust the XFF header if request really comes from one of them.', array(), $options),
+  );  
+  return $variables;
+}