diff -r c78774c7d032 Lib/cgi.py --- a/Lib/cgi.py Mon Jun 13 16:33:04 2016 +0200 +++ b/Lib/cgi.py Mon Jun 13 21:18:13 2016 +0200 @@ -759,7 +759,7 @@ if not data: self.done = -1 break - self.file.write(data) + self.__write(data) todo = todo - len(data) def read_lines(self):