Göre RFC 2616, ISO-8859-1 karakterleri özel olarak kodlanmış olmalıdır. Bu nedenle kim size başlıkları gönderiyor spec kırma gibi görünüyor. field-content ve TEXT bakınız.
4.2 Message Headers
message-header = field-name ":" [ field-value ]
field-name = token
field-value = *( field-content | LWS )
field-content = <the OCTETs making up the field-value
and consisting of either *TEXT or combinations
of token, separators, and quoted-string>
2.2 Basic Rules
TEXT = <any OCTET except CTLs,
but including LWS>
The TEXT rule is only used for descriptive field contents and values that are
not intended to be interpreted by the message parser. Words of *TEXT MAY contain characters from character sets other than ISO- 8859-1 [22] only when encoded according to the rules of RFC 2047 [14].