diff --git a/library/think/Response.php b/library/think/Response.php
index d531979f..5b86e940 100644
--- a/library/think/Response.php
+++ b/library/think/Response.php
@@ -100,7 +100,7 @@ class Response
             $data = call_user_func_array($this->transform, [$data]);
         }
 
-        define('RESPONSE_TYPE',$this->type);
+        defined('RESPONSE_TYPE') or define('RESPONSE_TYPE',$this->type);
 
         // 处理输出数据
         $data = $this->output($data);
diff --git a/start.php b/start.php
index b5a209ee..970fc937 100644
--- a/start.php
+++ b/start.php
@@ -21,7 +21,10 @@ if (is_file(ROOT_PATH . 'env' . EXT)) {
     $env = include ROOT_PATH . 'env' . EXT;
     foreach ($env as $key => $val) {
         $name = ENV_PREFIX . $key;
-        putenv("$name=".var_export($var,true));
+        if(is_bool($val)){
+            $val = $val ? 1 : 0;
+        }
+        putenv("$name=$var");
     }
 }
 // 自动识别调试模式