PJ Eby added the comment: You're right, it shouldn't send the headers until a non-empty string occurs. I don't see any problem with treating it as a bug, and fixing it. Your patch will also allow non-compliant behavior, though. It seems to me it would be better to fix the logic in write() to not call send_headers() if len(data)==0. That way, it will still error with "write() before start_response()" in the non-compliant case, but fix the compliance error. Feel free to reopen/retitle this issue for that.
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