diff --git a/Source/API/script/Config/config.php b/Source/API/script/Config/config.php
index ac9f8f9..6c17b53 100644
--- a/Source/API/script/Config/config.php
+++ b/Source/API/script/Config/config.php
@@ -2,7 +2,6 @@
 
 namespace Config;
 
-
 use PDOException;
 
 require_once __DIR__ ."/Connection.php";
@@ -21,9 +20,7 @@ class ConnectClass{
             $connection = new Connection($dsn,$login,$password);
 
         }catch (PDOException){
-
-            http_response_code(404);
-            return http_response_code();
+            throw new PDOException();
         }
         return $connection;
     }
diff --git a/Source/API/script/ExceptionHandle/HttpNotFoundError.php b/Source/API/script/ExceptionHandle/HttpNotFoundError.php
index 472c2ee..138a82c 100644
--- a/Source/API/script/ExceptionHandle/HttpNotFoundError.php
+++ b/Source/API/script/ExceptionHandle/HttpNotFoundError.php
@@ -9,6 +9,7 @@ use Throwable;
 class HttpNotFoundError extends HttpSpecializedException {
 
     protected $code = 404;
+    protected string $title = "Method Not Found";
     protected $message =  "Method not found on the API, verify the method's name.";
 
     public function __construct(ServerRequestInterface $request,?Throwable $previous = null)
diff --git a/Source/API/script/ExceptionHandle/PDOError.php b/Source/API/script/ExceptionHandle/PDOError.php
new file mode 100644
index 0000000..2db529f
--- /dev/null
+++ b/Source/API/script/ExceptionHandle/PDOError.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace ExceptionHandle;
+
+use Psr\Http\Message\ServerRequestInterface;
+use Slim\Exception\HttpSpecializedException;
+use Throwable;
+
+class PDOError extends HttpSpecializedException {
+
+    protected $code = 408;
+    protected string $title = "PDO connection failed";
+    protected $message =  "The connection method throw a PDO Exception, connection to database failed";
+
+    public function __construct(ServerRequestInterface $request,?Throwable $previous = null)
+    {
+        parent::__construct($request, $this->message, $previous);
+    }
+
+}
\ No newline at end of file
diff --git a/Source/API/script/ExceptionHandle/TypeErrorMethod.php b/Source/API/script/ExceptionHandle/TypeErrorMethod.php
index 11cf046..8e62105 100644
--- a/Source/API/script/ExceptionHandle/TypeErrorMethod.php
+++ b/Source/API/script/ExceptionHandle/TypeErrorMethod.php
@@ -9,6 +9,7 @@ use Throwable;
 class TypeErrorMethod extends HttpSpecializedException {
 
     protected $code = 400;
+    protected string $title = "Method query params is not specified";
     protected $message =  "Bad Parameters, The API need a 'method' query params in URL. Exemple :'http://url?method=getSomething'";
 
     public function __construct(ServerRequestInterface $request,?Throwable $previous = null)
diff --git a/Source/API/script/Gateway/GatewayForm.php b/Source/API/script/Gateway/GatewayForm.php
index f8f01e1..03d7b12 100644
--- a/Source/API/script/Gateway/GatewayForm.php
+++ b/Source/API/script/Gateway/GatewayForm.php
@@ -2,17 +2,20 @@
 
 namespace Gateway;
 
-use Config\Connection;
 use PDO;
-use Config\ConnectClass;
+use PDOException;
 
 class GatewayForm
 {
-    private Connection $connection;
+    private \Config\Connection $connection;
 
     public function __construct()
     {
-        $this->connection = (new ConnectClass)->connect();
+        try{
+            $this->connection = (new \Config\ConnectClass)->connect();
+        }catch(PDOException $e){
+            throw new PDOException();
+        }
     }
 
     public function insertForm(array $parameters): void
diff --git a/Source/API/script/Gateway/GatewayKeyword.php b/Source/API/script/Gateway/GatewayKeyword.php
index 4d751d3..e98b567 100644
--- a/Source/API/script/Gateway/GatewayKeyword.php
+++ b/Source/API/script/Gateway/GatewayKeyword.php
@@ -5,6 +5,7 @@ namespace Gateway;
 use Config\Connection;
 use Config\ConnectClass;
 use PDO;
+use PDOException;
 
 class GatewayKeyword
 {
@@ -12,8 +13,11 @@ class GatewayKeyword
 
     public function __construct()
     {
-        $this->connection = (new ConnectClass())->connect();
-    }
+        try{
+            $this->connection = (new ConnectClass)->connect();
+        }catch(PDOException $e){
+            throw new PDOException();
+        }    }
 
     public function insertKeyword(array $keyword): void
     {
diff --git a/Source/API/script/Gateway/GatewayListResponseOfCandidate.php b/Source/API/script/Gateway/GatewayListResponseOfCandidate.php
index fd19794..f8625f1 100644
--- a/Source/API/script/Gateway/GatewayListResponseOfCandidate.php
+++ b/Source/API/script/Gateway/GatewayListResponseOfCandidate.php
@@ -5,6 +5,7 @@ namespace Gateway;
 use Config\Connection;
 use Config\ConnectClass;
 use PDO;
+use PDOException;
 
 class GatewayListResponseOfCandidate
 {
@@ -12,8 +13,11 @@ class GatewayListResponseOfCandidate
 
     public function __construct()
     {
-        $this->connection = (new ConnectClass())->connect();
-    }
+        try{
+            $this->connection = (new ConnectClass)->connect();
+        }catch(PDOException $e){
+            throw new PDOException();
+        }    }
 
     public function getDetailsListResponsesOfCandidate(array $idListResponse): array
     {
diff --git a/Source/API/script/Gateway/GatewayPossibleResponse.php b/Source/API/script/Gateway/GatewayPossibleResponse.php
index 37146da..e3c901c 100644
--- a/Source/API/script/Gateway/GatewayPossibleResponse.php
+++ b/Source/API/script/Gateway/GatewayPossibleResponse.php
@@ -5,6 +5,7 @@ namespace Gateway;
 use Config\Connection;
 use Config\ConnectClass;
 use PDO;
+use PDOException;
 
 class GatewayPossibleResponse
 {
@@ -12,8 +13,11 @@ class GatewayPossibleResponse
 
     public function __construct()
     {
-        $this->connection = (new ConnectClass())->connect();
-    }
+        try{
+            $this->connection = (new ConnectClass)->connect();
+        }catch(PDOException $e){
+            throw new PDOException();
+        }    }
 
     public function getPossibleResponseByQuestion(array $idQuestion): array
     {
diff --git a/Source/API/script/Gateway/GatewayQuestion.php b/Source/API/script/Gateway/GatewayQuestion.php
index 3891933..67b84b2 100644
--- a/Source/API/script/Gateway/GatewayQuestion.php
+++ b/Source/API/script/Gateway/GatewayQuestion.php
@@ -5,6 +5,7 @@ namespace Gateway;
 use Config\Connection;
 use Config\ConnectClass;
 use PDO;
+use PDOException;
 
 class GatewayQuestion
 {
@@ -12,8 +13,11 @@ class GatewayQuestion
 
     public function __construct()
     {
-        $this->connection = (new ConnectClass())->connect();
-    }
+        try{
+            $this->connection = (new ConnectClass)->connect();
+        }catch(PDOException $e){
+            throw new PDOException();
+        }    }
 
     public function insertQuestion(QuestionAPI $question, int $idForm): void
     {
diff --git a/Source/API/script/Gateway/GatewayResponse.php b/Source/API/script/Gateway/GatewayResponse.php
index 6c5b290..3aad165 100644
--- a/Source/API/script/Gateway/GatewayResponse.php
+++ b/Source/API/script/Gateway/GatewayResponse.php
@@ -5,6 +5,7 @@ namespace Gateway;
 use Config\Connection;
 use Config\ConnectClass;
 use PDO;
+use PDOException;
 
 class GatewayResponse
 {
@@ -12,8 +13,11 @@ class GatewayResponse
 
     public function __construct()
     {
-        $this->connection = (new ConnectClass())->connect();
-    }
+        try{
+            $this->connection = (new ConnectClass)->connect();
+        }catch(PDOException $e){
+            throw new PDOException();
+        }    }
 
     public function getResponsesByIdListCandidate(array $listResponsesOfCandidateId): array
     {
diff --git a/Source/API/script/index.php b/Source/API/script/index.php
index 651d27f..33a070f 100644
--- a/Source/API/script/index.php
+++ b/Source/API/script/index.php
@@ -1,12 +1,12 @@
 <?php
 
 use ExceptionHandle\HttpNotFoundError;
+use ExceptionHandle\PDOError;
 use ExceptionHandle\TypeErrorMethod;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Slim\Factory\AppFactory;
 
-
 require 'Config/vendor/autoload.php';
 
 /**
@@ -40,10 +40,14 @@ $app->get('/', function (Request $request, Response $response) {
     $listGateway = array("\\Gateway\\GatewayForm", "\\Gateway\\GatewayKeyword", "\\Gateway\\GatewayQuestion");
     $ok = false;
     foreach ($listGateway as $gateway){
-        echo implode(",",get_class_methods((new $gateway)));
-        if (method_exists($gateway, $method)) {
-            $ok = true;
-            $response->getBody()->write(json_encode((new $gateway)->$method($parameters)));
+        try {
+            echo implode(",", get_class_methods((new $gateway)));
+            if (method_exists($gateway, $method)) {
+                $ok = true;
+                $response->getBody()->write(json_encode((new $gateway)->$method($parameters)));
+            }
+        }catch (PDOException $e){
+            throw new PDOError($request);
         }
     }
     if (!$ok){