Fix CRLF sequence

[cookie-s]

This PR fixes CRLF replacement.

References:

https://datatracker.ietf.org/doc/html/rfc7230#section-1.2

The following core rules are included by reference, as defined in
[RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF
(CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),
HEXDIG (hexadecimal 0-9/A-F/a-f), HTAB (horizontal tab), LF (line
feed), OCTET (any 8-bit sequence of data), SP (space), and VCHAR (any
visible [USASCII] character).

https://datatracker.ietf.org/doc/html/rfc5234#appendix-B.1

CR             =  %x0D
                                ; carriage return
CRLF           =  CR LF
                                ; Internet standard newline
:
:
LF             =  %x0A
                                ; linefeed

https://doc.rust-lang.org/reference/tokens.html#ascii-escapes

\n | Newline
\r | Carriage return