Proper syntax for optional header parameter for text/csv mimetype?

csv, mime-types, rfc4180

Solution

The "header" parameter indicates the presence or absence of the header line. Valid values are "present" or "absent".

So if you use that parameter, the full MIME type would be `text/csv; header=present` or `text/csv; header=absent`.

Problem

According to RFC 4180: ...the presence or absence of the header line should be indicated via the optional "header" parameter of this MIME type... So, does that mean the correct string is: ``` text/csv; header ``` Or perhaps: ``` text/csv; header=true ``` Or something else?

Original source