调整优化

@@ -250,7 +250,7 @@ class Body {
                 $data->set($name,' '.$head,true);
                 $data->set($name,' '.$head,true);
             }else{
             }else{
                 list($name,$value) = explode(":",$head,2);
                 list($name,$value) = explode(":",$head,2);
-                $data->set($name,trim($value));
+                $data->set($name,trim((string) ($value===null?'':$value)));
             }
             }
         }
         }