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				@@ -138,6 +138,21 @@ $databases = []; 
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				  * request as needed.  The fourth line creates a new database with a name of 
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				  * "extra". 
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				  * 
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				+ * For MySQL, MariaDB or equivalent databases the 'isolation_level' option can 
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				+ * be set. The recommended transaction isolation level for Drupal sites is 
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				+ * 'READ COMMITTED'. The 'REPEATABLE READ' option is supported but can result 
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				+ * in deadlocks, the other two options are 'READ UNCOMMITTED' and 'SERIALIZABLE'. 
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				+ * They are available but not supported; use them at your own risk. For more 
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				+ * info: 
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				+ * https://dev.mysql.com/doc/refman/5.7/en/innodb-transaction-isolation-levels.html 
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				+ * 
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				+ * On your settings.php, change the isolation level: 
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				+ * @code 
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				+ * $databases['default']['default']['init_commands'] = [ 
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				+ *   'isolation_level' => 'SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED', 
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				+ * ]; 
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				+ * @endcode 
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				+ * 
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				  * You can optionally set a prefix for all database table names by using the 
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				  * 'prefix' setting. If a prefix is specified, the table name will be prepended 
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				  * with its value. Be sure to use valid database characters only, usually 
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				@@ -343,10 +358,13 @@ $settings['update_free_access'] = FALSE; 
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				 # $settings['reverse_proxy'] = TRUE; 
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				 /** 
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				- * Specify every reverse proxy IP address in your environment. 
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				- * This setting is required if $settings['reverse_proxy'] is TRUE. 
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				+ * Reverse proxy addresses. 
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				+ * 
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				+ * Specify every reverse proxy IP address in your environment, as an array of 
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				+ * IPv4/IPv6 addresses or subnets in CIDR notation. This setting is required if 
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				+ * $settings['reverse_proxy'] is TRUE. 
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				  */ 
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				-# $settings['reverse_proxy_addresses'] = ['a.b.c.d', ...]; 
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				+# $settings['reverse_proxy_addresses'] = ['a.b.c.d', 'e.f.g.h/24', ...]; 
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				 /** 
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				  * Reverse proxy trusted headers. 
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				@@ -576,7 +594,7 @@ $settings['update_free_access'] = FALSE; 
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				  * 
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				  * Note: This setting does not apply to installation and update pages. 
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				  */ 
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				-# $settings['maintenance_theme'] = 'bartik'; 
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				+# $settings['maintenance_theme'] = 'claro'; 
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				 /** 
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				  * PHP settings: 
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				@@ -601,21 +619,6 @@ $settings['update_free_access'] = FALSE; 
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				 # ini_set('pcre.backtrack_limit', 200000); 
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				 # ini_set('pcre.recursion_limit', 200000); 
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				-/** 
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				- * Add Permissions-Policy header to disable Google FLoC. 
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				- * 
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				- * By default, Drupal sends the 'Permissions-Policy: interest-cohort=()' header 
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				- * to disable Google's Federated Learning of Cohorts feature, introduced in 
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				- * Chrome 89. 
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				- * 
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				- * See https://en.wikipedia.org/wiki/Federated_Learning_of_Cohorts for more 
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				- * information about FLoC. 
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				- * 
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				- * If you don't wish to disable FLoC in Chrome, you can set this value 
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				- * to FALSE. 
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				- */ 
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				-# $settings['block_interest_cohort'] = TRUE; 
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				- 
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				 /** 
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				  * Configuration overrides. 
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				  * 
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				@@ -641,33 +644,6 @@ $settings['update_free_access'] = FALSE; 
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				 # $config['system.site']['name'] = 'My Drupal site'; 
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				 # $config['user.settings']['anonymous'] = 'Visitor'; 
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				-/** 
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				- * Fast 404 pages: 
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				- * 
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				- * Drupal can generate fully themed 404 pages. However, some of these responses 
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				- * are for images or other resource files that are not displayed to the user. 
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				- * This can waste bandwidth, and also generate server load. 
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				- * 
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				- * The options below return a simple, fast 404 page for URLs matching a 
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				- * specific pattern: 
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				- * - $config['system.performance']['fast_404']['exclude_paths']: A regular 
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				- *   expression to match paths to exclude, such as images generated by image 
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				- *   styles, or dynamically-resized images. The default pattern provided below 
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				- *   also excludes the private file system. If you need to add more paths, you 
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				- *   can add '|path' to the expression. 
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				- * - $config['system.performance']['fast_404']['paths']: A regular expression to 
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				- *   match paths that should return a simple 404 page, rather than the fully 
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				- *   themed 404 page. If you don't have any aliases ending in htm or html you 
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				- *   can add '|s?html?' to the expression. 
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				- * - $config['system.performance']['fast_404']['html']: The html to return for 
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				- *   simple 404 pages. 
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				- * 
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				- * Remove the leading hash signs if you would like to alter this functionality. 
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				- */ 
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				-# $config['system.performance']['fast_404']['exclude_paths'] = '/\/(?:styles)|(?:system\/files)\//'; 
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				-# $config['system.performance']['fast_404']['paths'] = '/\.(?:txt|png|gif|jpe?g|css|js|ico|swf|flv|cgi|bat|pl|dll|exe|asp)$/i'; 
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				-# $config['system.performance']['fast_404']['html'] = '<!DOCTYPE html><html><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL "@path" was not found on this server.</p></body></html>'; 
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				- 
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				 /** 
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				  * Load services definition file. 
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				  */ 
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				@@ -777,6 +753,49 @@ $settings['entity_update_backup'] = TRUE; 
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				  */ 
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				 $settings['migrate_node_migrate_type_classic'] = FALSE; 
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				+/** 
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				+ * The default settings for migration sources. 
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				+ * 
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				+ * These settings are used as the default settings on the Credential form at 
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				+ * /upgrade/credentials. 
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				+ * 
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				+ * - migrate_source_version - The version of the source database. This can be 
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				+ *   '6' or '7'. Defaults to '7'. 
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				+ * - migrate_source_connection - The key in the $databases array for the source 
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				+ *   site. 
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				+ * - migrate_file_public_path - The location of the source Drupal 6 or Drupal 7 
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				+ *   public files. This can be a local file directory containing the source 
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				+ *   Drupal 6 or Drupal 7 site (e.g /var/www/docroot), or the site address 
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				+ *   (e.g http://example.com). 
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				+ * - migrate_file_private_path - The location of the source Drupal 7 private 
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				+ *   files. This can be a local file directory containing the source Drupal 7 
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				+ *   site (e.g /var/www/docroot), or empty to use the same value as Public 
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				+ *   files directory. 
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				+ * 
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				+ * Sample configuration for a drupal 6 source site with the source files in a 
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				+ * local directory. 
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				+ * 
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				+ * @code 
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				+ * $settings['migrate_source_version'] = '6'; 
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				+ * $settings['migrate_source_connection'] = 'migrate'; 
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				+ * $settings['migrate_file_public_path'] = '/var/www/drupal6'; 
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				+ * @endcode 
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				+ * 
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				+ * Sample configuration for a drupal 7 source site with public source files on 
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				+ * the source site and the private files in a local directory. 
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				+ * 
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				+ * @code 
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				+ * $settings['migrate_source_version'] = '7'; 
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				+ * $settings['migrate_source_connection'] = 'migrate'; 
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				+ * $settings['migrate_file_public_path'] = 'https://drupal7.com'; 
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				+ * $settings['migrate_file_private_path'] = '/var/www/drupal7'; 
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				+ * @endcode 
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				+ */ 
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				+# $settings['migrate_source_connection'] = ''; 
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				+# $settings['migrate_source_version'] = ''; 
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				+# $settings['migrate_file_public_path'] = ''; 
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				+# $settings['migrate_file_private_path'] = ''; 
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				+ 
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				 /** 
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				  * Load local development override configuration, if available. 
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				  * 
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