Two misconceptions here (one in theory, the other in implementation). Most web servers adapt fine to different newline styles, so normally this isn't a problem, but you are correct in that the "correct" newline representation wasn't accurate in the original code.

However, "\r\n" is not the way a correct newline should be represented. \n does not have a direct, portable mapping to a specific ASCII code. Instead, it's Perl's representation of a "newline", which WILL vary depending upon the OS being used. Thus, while "\r\n" will give you the desired results under Unix, it will break even more under Windows or on MacOS. If you want to be strict about your newlines, you need to use "\015\012".