diff --git a/RestControllers/conversationsController.php b/RestControllers/conversationsController.php
index 4053a41..87804db 100644
--- a/RestControllers/conversationsController.php
+++ b/RestControllers/conversationsController.php
@@ -67,7 +67,7 @@ class conversationsController{
 
 		//Check for parametres
 		if(!check_post_parametres(array("name", "follow", "users")))
-			Rest_fatal_error(501, "Please check parametres passed with the request !");
+			Rest_fatal_error(400, "Please check parametres passed with the request !");
 		
 		//Extract parametres
 		$conversationName = ($_POST["name"] == "false" ? false : $_POST['name']);
@@ -106,7 +106,7 @@ class conversationsController{
 
 		//Check conversation ID was specified
 		if(!isset($_POST["conversationID"]))
-			Rest_fatal_error("501", "Please specify a conversation ID !");
+			Rest_fatal_error(400, "Please specify a conversation ID !");
 		$conversationID = toInt($_POST["conversationID"]);
 
 		//Check if the user is a conversation moderator or not
@@ -156,4 +156,19 @@ class conversationsController{
 		//Success
 		return array("success" => "Conversation informations were successfully updated !");
 	}
+
+	/**
+	 * Find (create ?) and return private conversation ID
+	 *
+	 * @url POST /conversations/getPrivate
+	 */
+	public function findPrivate(){
+
+		user_login_required();
+
+		//Check for parametres
+		if(!isset($_POST['user1']) OR !isset($_POST['user2']))
+			Rest_fatal_error(400, "Please check your parametres")
+
+	}
 }
\ No newline at end of file
diff --git a/RestControllers/friendsController.php b/RestControllers/friendsController.php
index 22e1978..0ddc510 100644
--- a/RestControllers/friendsController.php
+++ b/RestControllers/friendsController.php
@@ -36,7 +36,7 @@ class friendsController{
 
 		//Check parametres
 		if(!isset($_POST["friendID"]) OR !isset($_POST['accept']))
-			Rest_fatal_error(501, "Please check your parametres !");
+			Rest_fatal_error(400, "Please check your parametres !");
 		
 		//Extract informations and process request
 		$friendID = toInt($_POST['friendID']);
diff --git a/RestControllers/userController.php b/RestControllers/userController.php
index 05d8052..08db42a 100644
--- a/RestControllers/userController.php
+++ b/RestControllers/userController.php
@@ -18,7 +18,7 @@ class userController
 	public function connectUSER(){
 		 //Check variables sent in request
 		 if(!isset($_POST['userMail']) OR !isset($_POST['userPassword']))
-			throw new RestException(401, "Missing data !");
+			throw new RestException(400, "Missing data !");
 		
 		//Retrieve database connection
 		$db = CS::get()->db;;