diff --git a/src/Client.php b/src/Client.php
index 2e85377..7dddfaf 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -118,7 +118,8 @@ class Client extends JsonRpc
             }
             if (isset($body['error']) && isset($body['error']['code']) && isset($body['error']['message'])) {
                 $message = is_array($body['error']['message']) ? json_encode($body['error']['message']) : $body['error']['message'];
-                throw new RpcServerException($message, $body['error']['code']);
+                $e = new RpcServerException($message, $body['error']['code']);
+                throw $e;
             }
 
             return $body['result'];
diff --git a/src/Providers/BaseServiceProvider.php b/src/Providers/BaseServiceProvider.php
index 4200a9d..9a74fd6 100644
--- a/src/Providers/BaseServiceProvider.php
+++ b/src/Providers/BaseServiceProvider.php
@@ -20,7 +20,9 @@ class BaseServiceProvider extends ServiceProvider
             //local
             '127.0.0.1',
             //北京办公区
-            '172.16.100.0/16'
+            '172.16.100.0/16',
+            //aliyun slb
+            '100.116.71.0/16',
         ], Request::HEADER_X_FORWARDED_ALL);
     }
 
diff --git a/src/views/tool.blade.php b/src/views/tool.blade.php
index 5d211d7..04f31d7 100644
--- a/src/views/tool.blade.php
+++ b/src/views/tool.blade.php
@@ -81,9 +81,12 @@
                         code&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: {{$error['code']}} <br>
                         message : {{$error['message']}}
                     </div>
-                    <h5>返回内容:</h5>
-                    <iframe style="width: 100%;height: 500px;border: none;" srcdoc='{{$error['resp']->getBody()}}'></iframe>
-                    <hr>
+                    @if($error['resp'])
+                        <h5>返回内容:</h5>
+                        <iframe style="width: 100%;height: 500px;border: none;"
+                                srcdoc='{{$error['resp']->getBody()}}'></iframe>
+                        <hr>
+                    @endif
                 @endif
                 @if( !empty($result) )
                     <h5>Result:</h5>