TEMP : try with implode(array)

Source/API/script/index.php

@@ -40,9 +40,7 @@ try{
                 }
             }
             $temp = array('response' => "Rien", 'test' => "Test Ici");
-            foreach ($temp as $key => $value) {
+            $response->getBody()->write(implode($temp));//'"'.$key.'": "'.$value.'"');
-                $response->getBody()->write($key."=>".$value);//'"'.$key.'": "'.$value.'"');
-            }
             //return $response;
             return $response->withHeader('Content-type', 'application/json');
         });