diff --git a/src/Socialbox/Abstracts/CacheLayer.php b/src/Socialbox/Abstracts/CacheLayer.php
index 4e07a5c..3e1f7af 100644
--- a/src/Socialbox/Abstracts/CacheLayer.php
+++ b/src/Socialbox/Abstracts/CacheLayer.php
@@ -1,90 +1,90 @@
 <?php
 
-namespace Socialbox\Abstracts;
+    namespace Socialbox\Abstracts;
 
-use RuntimeException;
-use Socialbox\Classes\CacheLayer\MemcachedCacheLayer;
-use Socialbox\Classes\CacheLayer\RedisCacheLayer;
-use Socialbox\Classes\Configuration;
+    use RuntimeException;
+    use Socialbox\Classes\CacheLayer\MemcachedCacheLayer;
+    use Socialbox\Classes\CacheLayer\RedisCacheLayer;
+    use Socialbox\Classes\Configuration;
 
-abstract class CacheLayer
-{
-    private static ?CacheLayer $instance = null;
-
-    /**
-     * Stores a value in the cache with an associated key and an optional time-to-live (TTL).
-     *
-     * @param string $key The key under which the value is stored.
-     * @param mixed $value The value to be stored.
-     * @param int $ttl Optional. The time-to-live for the cache entry in seconds. A value of 0 indicates no expiration.
-     * @return bool Returns true if the value was successfully set, false otherwise.
-     */
-    public abstract function set(string $key, mixed $value, int $ttl=0): bool;
-
-    /**
-     * Retrieves a value from the cache with the specified key.
-     *
-     * @param string $key The key of the value to retrieve.
-     * @return mixed The value associated with the key, or null if the key does not exist.
-     */
-    public abstract function get(string $key): mixed;
-
-    /**
-     * Deletes a value from the cache with the specified key.
-     *
-     * @param string $key The key of the value to delete.
-     * @return bool Returns true if the value was successfully deleted, false otherwise.
-     */
-    public abstract function delete(string $key): bool;
-
-    /**
-     * Checks if a value exists in the cache with the specified key.
-     *
-     * @param string $key The key to check.
-     * @return bool Returns true if the key exists, false otherwise.
-     */
-    public abstract function exists(string $key): bool;
-
-    /**
-     * Counts the number of items that start with the given prefix.
-     *
-     * @param string $prefix The prefix to search for.
-     * @return int The count of items starting with the provided prefix.
-     */
-    public abstract function getPrefixCount(string $prefix): int;
-
-    /**
-     * Clears all values from the cache.
-     *
-     * @return bool Returns true if the cache was successfully cleared, false otherwise.
-     */
-    public abstract function clear(): bool;
-
-    /**
-     * Retrieves the singleton instance of the cache layer.
-     *
-     * @return CacheLayer The singleton instance of the cache layer.
-     */
-    public static function getInstance(): CacheLayer
+    abstract class CacheLayer
     {
-        if (self::$instance === null)
+        private static ?CacheLayer $instance = null;
+
+        /**
+         * Stores a value in the cache with an associated key and an optional time-to-live (TTL).
+         *
+         * @param string $key The key under which the value is stored.
+         * @param mixed $value The value to be stored.
+         * @param int $ttl Optional. The time-to-live for the cache entry in seconds. A value of 0 indicates no expiration.
+         * @return bool Returns true if the value was successfully set, false otherwise.
+         */
+        public abstract function set(string $key, mixed $value, int $ttl=0): bool;
+
+        /**
+         * Retrieves a value from the cache with the specified key.
+         *
+         * @param string $key The key of the value to retrieve.
+         * @return mixed The value associated with the key, or null if the key does not exist.
+         */
+        public abstract function get(string $key): mixed;
+
+        /**
+         * Deletes a value from the cache with the specified key.
+         *
+         * @param string $key The key of the value to delete.
+         * @return bool Returns true if the value was successfully deleted, false otherwise.
+         */
+        public abstract function delete(string $key): bool;
+
+        /**
+         * Checks if a value exists in the cache with the specified key.
+         *
+         * @param string $key The key to check.
+         * @return bool Returns true if the key exists, false otherwise.
+         */
+        public abstract function exists(string $key): bool;
+
+        /**
+         * Counts the number of items that start with the given prefix.
+         *
+         * @param string $prefix The prefix to search for.
+         * @return int The count of items starting with the provided prefix.
+         */
+        public abstract function getPrefixCount(string $prefix): int;
+
+        /**
+         * Clears all values from the cache.
+         *
+         * @return bool Returns true if the cache was successfully cleared, false otherwise.
+         */
+        public abstract function clear(): bool;
+
+        /**
+         * Retrieves the singleton instance of the cache layer.
+         *
+         * @return CacheLayer The singleton instance of the cache layer.
+         */
+        public static function getInstance(): CacheLayer
         {
-            $engine = Configuration::getCacheConfiguration()->getEngine();
+            if (self::$instance === null)
+            {
+                $engine = Configuration::getCacheConfiguration()->getEngine();
 
-            if ($engine === 'redis')
-            {
-                self::$instance = new RedisCacheLayer();
-            }
-            else if ($engine === 'memcached')
-            {
-                self::$instance = new MemcachedCacheLayer();
-            }
-            else
-            {
-                throw new RuntimeException('Invalid cache engine specified in the configuration, must be either "redis" or "memcached".');
+                if ($engine === 'redis')
+                {
+                    self::$instance = new RedisCacheLayer();
+                }
+                else if ($engine === 'memcached')
+                {
+                    self::$instance = new MemcachedCacheLayer();
+                }
+                else
+                {
+                    throw new RuntimeException('Invalid cache engine specified in the configuration, must be either "redis" or "memcached".');
+                }
             }
+
+            return self::$instance;
         }
-
-        return self::$instance;
-    }
-}
\ No newline at end of file
+    }
\ No newline at end of file
diff --git a/src/Socialbox/Socialbox.php b/src/Socialbox/Socialbox.php
index 4d4b0c6..7feb1d3 100644
--- a/src/Socialbox/Socialbox.php
+++ b/src/Socialbox/Socialbox.php
@@ -127,6 +127,12 @@
                      return;
                }
             }
+            else
+            {
+                http_response_code(400);
+                print('External domains are not supported yet');
+                return;
+            }
 
             try
             {