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CR
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... requirement and allows the
transport of text media with plain CR or LF alone representing a line
break when it is done consistently for an entire entity ...
... HTTP
applications MUST accept CRLF, bare CR, and bare LF as being
representative of a line break ...
... addition, if the text is represented in a character set that does not
use octets 13 and 10 for CR and LF respectively, as is the case for
some multi-byte character sets ...
... sequences are defined by that character set to represent the
equivalent of CR and LF for line breaks. This flexibility regarding
...
... line breaks applies only to text media in the entity-body; a bare CR
or LF MUST NOT be substituted for CRLF ...
... headers,
recognize a single LF as a line terminator and ignore the leading CR.
The character set ...
... allows the use of some character sets which do not use octets 13 and
10 to represent CR and LF, as is the case for some multi-byte
character sets ...