If I'm not mistaken CRLF is part of the HTTP spec as a field separator. Edit: I've read the article after this comment, now I see what the parent comment meant

If I'm not mistaken CRLF is part of the HTTP spec as a field separator. Edit: I've read the article after this comment, now I see what the parent comment meant. I guess in this case sth like "\r\n".join(["line1", "line2", "line3"]) is best.