grumblor <gitgrumb...@gmail.com> added the comment:

perhaps simply returning the method if _headers_buffer isn't defined is better 
since there is probably nothing to flush.

    def end_headers(self):
        if not hasattr(self, '_headers_buffer'):
            return 1 
        """Send the blank line ending the MIME headers."""
        if self.request_version != 'HTTP/0.9':
            self._headers_buffer.append(b"\r\n")
            self.flush_headers()

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43474>
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