Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

sites/default/default.services.pantheon.preproduction.yml

@@ -0,0 +1,15 @@
+#
+# Rename this file to 'services.pantheon.preproduction.yml' and
+# modify to suit.  It will then be loaded by settings.pantheon.php
+# on any dev or multidev environment (not on 'test' or 'live').
+#
+# If you would like to define any services or service parameters
+# that apply only to production environments ('test' and 'live'),
+# you may do so in a 'services.pantheon.production.yml' file.
+#
+# See 'default.services.yml' for information on useful settings to
+# put here.
+#
+parameters:
+  twig.config:
+    debug: true

sites/default/default.services.yml

@@ -153,3 +153,22 @@ parameters:
     - sftp
     - webcal
     - rtsp
+
+   # Configure Cross-Site HTTP requests (CORS).
+   # Read https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
+   # for more information about the topic in general.
+   # Note: By default the configuration is disabled.
+  cors.config:
+    enabled: false
+    # Specify allowed headers, like 'x-allowed-header'.
+    allowedHeaders: []
+    # Specify allowed request methods, specify ['*'] to allow all possible ones.
+    allowedMethods: []
+    # Configure requests allowed from specific origins.
+    allowedOrigins: ['*']
+    # Sets the Access-Control-Expose-Headers header.
+    exposedHeaders: false
+    # Sets the Access-Control-Max-Age header.
+    maxAge: false
+    # Sets the Access-Control-Allow-Credentials header.
+    supportsCredentials: false

sites/default/default.settings.php

@@ -417,6 +417,20 @@ $settings['update_free_access'] = FALSE;
  */
 # $settings['omit_vary_cookie'] = TRUE;
 
+
+/**
+ * Cache TTL for client error (4xx) responses.
+ *
+ * Items cached per-URL tend to result in a large number of cache items, and
+ * this can be problematic on 404 pages which by their nature are unbounded. A
+ * fixed TTL can be set for these items, defaulting to one hour, so that cache
+ * backends which do not support LRU can purge older entries. To disable caching
+ * of client error responses set the value to 0. Currently applies only to
+ * page_cache module.
+ */
+# $settings['cache_ttl_4xx'] = 3600;
+
+
 /**
  * Class Loader.
  *
@@ -664,6 +678,15 @@ $settings['container_yamls'][] = __DIR__ . '/services.yml';
  */
 # $settings['container_base_class'] = '\Drupal\Core\DependencyInjection\Container';
 
+/**
+ * Override the default yaml parser class.
+ *
+ * Provide a fully qualified class name here if you would like to provide an
+ * alternate implementation YAML parser. The class must implement the
+ * \Drupal\Component\Serialization\SerializationInterface interface.
+ */
+# $settings['yaml_parser_class'] = NULL;
+
 /**
  * Trusted host configuration.
  *
@@ -701,6 +724,21 @@ $settings['container_yamls'][] = __DIR__ . '/services.yml';
  * example.org, with all subdomains included.
  */
 
+/**
+ * The default list of directories that will be ignored by Drupal's file API.
+ *
+ * By default ignore node_modules and bower_components folders to avoid issues
+ * with common frontend tools and recursive scanning of directories looking for
+ * extensions.
+ *
+ * @see file_scan_directory()
+ * @see \Drupal\Core\Extension\ExtensionDiscovery::scanDirectory()
+ */
+$settings['file_scan_ignore_directories'] = [
+  'node_modules',
+  'bower_components',
+];
+
 /**
  * Include the Pantheon-specific settings file.
  *

sites/default/settings.pantheon.php

@@ -25,7 +25,25 @@
  * not to any Drupal files.
  */
 if (!defined("PANTHEON_VERSION")) {
-  define("PANTHEON_VERSION", "2");
+  define("PANTHEON_VERSION", "3");
+}
+
+/**
+ * Determine whether this is a preproduction or production environment, and
+ * then load the pantheon services.yml file.  This file should be named either
+ * 'pantheon-production-services.yml' (for 'live' or 'test' environments)
+ * 'pantheon-preproduction-services.yml' (for 'dev' or multidev environments).
+ */
+$pantheon_services_file = __DIR__ . '/services.pantheon.preproduction.yml';
+if (
+  isset($_ENV['PANTHEON_ENVIRONMENT']) &&
+  ( ($_ENV['PANTHEON_ENVIRONMENT'] == 'live') || ($_ENV['PANTHEON_ENVIRONMENT'] == 'test') )
+) {
+  $pantheon_services_file = __DIR__ . '/services.pantheon.production.yml';
+}
+
+if (file_exists($pantheon_services_file)) {
+  $settings['container_yamls'][] = $pantheon_services_file;
 }
 
 /**
@@ -136,3 +154,20 @@ if (isset($_ENV['PANTHEON_ENVIRONMENT'])) {
 }
 
 
+/**
+ * The default list of directories that will be ignored by Drupal's file API.
+ *
+ * By default ignore node_modules and bower_components folders to avoid issues
+ * with common frontend tools and recursive scanning of directories looking for
+ * extensions.
+ *
+ * @see file_scan_directory()
+ * @see \Drupal\Core\Extension\ExtensionDiscovery::scanDirectory()
+ */
+if (empty($settings['file_scan_ignore_directories'])) {
+  $settings['file_scan_ignore_directories'] = [
+    'node_modules',
+    'bower_components',
+  ];
+}
+